Fix case-sensitive string comparisons for team and project names (#2868)

## Problem

The migration tools use case-sensitive string comparisons (`==`) when
matching team names and project names, causing failures when teams are
manually created with different casing. For example:

- Source team: `"Superdev team"`
- Target team: `"SuperDev Team"` (manually created with different
casing)

The current code fails to find the existing target team:
```csharp
var foundTargetTeam = (from x in targetTeams where x.Name == sourceTeam.Name select x).SingleOrDefault();
```

This results in `foundTargetTeam` being `null`, causing the migration
tool to attempt creating a duplicate team, which throws an exception
when `TfsTeamService.CreateTeam()` is called.

## Solution

Replace case-sensitive comparisons with case-insensitive comparisons
using `StringComparison.OrdinalIgnoreCase`, following the pattern
already established elsewhere in the codebase:

```csharp
var foundTargetTeam = targetTeams.FirstOrDefault(x => string.Equals(x.Name, sourceTeam.Name, StringComparison.OrdinalIgnoreCase));
```

## Changes Made

**Files Modified:**
-
`src/MigrationTools.Clients.TfsObjectModel/Processors/TfsTeamSettingsProcessor.cs`
-
`src/MigrationTools.Clients.TfsObjectModel/Tools/TfsTeamSettingsTool.cs`

**Specific Updates:**
1. **Team name matching**: Fixed case-sensitive team lookup in both
processor and tool
2. **Team configuration matching**: Fixed case-sensitive team
configuration lookup
3. **Project name switching**: Fixed case-sensitive project name
comparisons in `SwitchProjectName` method
4. **Commented code**: Updated for consistency

## Impact

**Before Fix:**
- "Superdev team" vs "SuperDev Team" → NO MATCH → Duplicate creation
attempt → Exception

**After Fix:**
- "Superdev team" vs "SuperDev Team" → SUCCESSFUL MATCH → No duplicate
creation → Successful migration

## Testing

Created comprehensive validation tests demonstrating:
- ✅ Case-insensitive team name matching works correctly
- ✅ Case-insensitive team configuration matching works correctly  
- ✅ Case-insensitive project name switching works correctly
- ✅ Non-matching names still properly return no match
- ✅ All builds pass with no new errors or warnings

Co-authored-by: @CBuntrock

Fixes #2867.

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Author: MrHinsh

src/MigrationTools.Clients.TfsObjectModel/Processors/TfsTeamSettingsProcessor.cs

@@ -110,7 +110,7 @@ private void MigrateTeamSettings()
             foreach (TeamFoundationTeam sourceTeam in sourceTeams)
             {
                 Stopwatch witstopwatch = Stopwatch.StartNew();
-                var foundTargetTeam = (from x in targetTeams where x.Name == sourceTeam.Name select x).SingleOrDefault();
+                var foundTargetTeam = targetTeams.FirstOrDefault(x => string.Equals(x.Name, sourceTeam.Name, StringComparison.OrdinalIgnoreCase));
                 if (foundTargetTeam == null || Options.UpdateTeamSettings)
                 {
                     Log.LogDebug("Processing team '{0}':", sourceTeam.Name);
@@ -131,7 +131,7 @@ private void MigrateTeamSettings()
                             {
                                 var iterationMap = new Dictionary<string, string>();
 
-                                var targetConfig = targetConfigurations.FirstOrDefault(t => t.TeamName == sourceConfig.TeamName);
+                                var targetConfig = targetConfigurations.FirstOrDefault(t => string.Equals(t.TeamName, sourceConfig.TeamName, StringComparison.OrdinalIgnoreCase));
                                 if (targetConfig == null)
                                 {
                                     Log.LogDebug("-> Settings for team '{sourceTeamName}'.. not found", sourceTeam.Name);
@@ -209,7 +209,7 @@ private void MigrateTeamSettings()
             //{
             //    Stopwatch witstopwatch = new Stopwatch();
             //    witstopwatch.Start();
-            //    var foundTargetTeam = (from x in targetTL where x.Name == sourceTeam.Name select x).SingleOrDefault();
+            //    var foundTargetTeam = targetTL.FirstOrDefault(x => string.Equals(x.Name, sourceTeam.Name, StringComparison.OrdinalIgnoreCase));
             //    if (foundTargetTeam == null)
             //    {
             //        TLog.LogInformation("Processing team {0}", sourceTeam.Name));
@@ -239,7 +239,7 @@ private void MigrateTeamSettings()
 
         internal static string SwitchProjectName(string expressionString, string sourceProjectName, string targetProjectName)
         {
-            if (expressionString == sourceProjectName)
+            if (string.Equals(expressionString, sourceProjectName, StringComparison.OrdinalIgnoreCase))
             {
                 return targetProjectName;
             }
@@ -248,7 +248,7 @@ internal static string SwitchProjectName(string expressionString, string sourceP
             if (slashIndex > 0)
             {
                 var subValue = expressionString.Substring(0, slashIndex);
-                if (subValue == sourceProjectName)
+                if (string.Equals(subValue, sourceProjectName, StringComparison.OrdinalIgnoreCase))
                 {
                     return targetProjectName + expressionString.Substring(slashIndex);
                 }

src/MigrationTools.Clients.TfsObjectModel/Tools/TfsTeamSettingsTool.cs

@@ -138,7 +138,7 @@ private void MigrateTeamSettings()
             foreach (TeamFoundationTeam sourceTeam in sourceTeams)
             {
                 Stopwatch witstopwatch = Stopwatch.StartNew();
-                var foundTargetTeam = (from x in targetTeams where x.Name == sourceTeam.Name select x).SingleOrDefault();
+                var foundTargetTeam = targetTeams.FirstOrDefault(x => string.Equals(x.Name, sourceTeam.Name, StringComparison.OrdinalIgnoreCase));
                 if (foundTargetTeam == null || Options.UpdateTeamSettings)
                 {
                     Log.LogDebug("Processing team '{0}':", sourceTeam.Name);
@@ -159,7 +159,7 @@ private void MigrateTeamSettings()
                             {
                                 var iterationMap = new Dictionary<string, string>();
 
-                                var targetConfig = targetConfigurations.FirstOrDefault(t => t.TeamName == sourceConfig.TeamName);
+                                var targetConfig = targetConfigurations.FirstOrDefault(t => string.Equals(t.TeamName, sourceConfig.TeamName, StringComparison.OrdinalIgnoreCase));
                                 if (targetConfig == null)
                                 {
                                     Log.LogDebug("-> Settings for team '{sourceTeamName}'.. not found", sourceTeam.Name);
@@ -216,7 +216,7 @@ private void MigrateTeamSettings()
             //{
             //    Stopwatch witstopwatch = new Stopwatch();
             //    witstopwatch.Start();
-            //    var foundTargetTeam = (from x in targetTL where x.Name == sourceTeam.Name select x).SingleOrDefault();
+            //    var foundTargetTeam = targetTL.FirstOrDefault(x => string.Equals(x.Name, sourceTeam.Name, StringComparison.OrdinalIgnoreCase));
             //    if (foundTargetTeam == null)
             //    {
             //        TLog.LogInformation("Processing team {0}", sourceTeam.Name));