Fix PropertyInjectionSourceGenerator processing static extension method classes

[Copilot]

The PropertyInjectionSourceGenerator in v0.57.63 was incorrectly processing static classes containing extension methods, generating invalid C# syntax that caused compilation errors:

CS1026: ) expected
CS1002: ; expected  
CS1513: } expected
The type name 'extension' does not exist in the type 'PhoneNumberFixtures'

The issue occurred because the generator's GetClassWithDataSourceProperties method processed all TypeDeclarationSyntax nodes but only filtered out abstract classes. Static classes (including extension method classes) were being processed even though they cannot be instantiated and cannot have instance properties that need injection.

Root cause: Static extension method classes like this were being processed:

public static class PhoneNumberFixtures
{
    public static PhoneNumber CreateValid(this PhoneNumber phoneNumber)
    {
        return new PhoneNumber("123-456-7890");
    }
}

Solution: Added || typeSymbol.IsStatic to the existing filtering condition in PropertyInjectionSourceGenerator.cs line 36:

// Before:
if (semanticModel.GetDeclaredSymbol(typeDecl) is not INamedTypeSymbol typeSymbol || typeSymbol.IsAbstract)

// After: 
if (semanticModel.GetDeclaredSymbol(typeDecl) is not INamedTypeSymbol typeSymbol || typeSymbol.IsAbstract || typeSymbol.IsStatic)

This minimal change ensures static classes are filtered out just like abstract classes, preventing the generator from attempting to create property injection code for classes that cannot be instantiated.

Fixes #3084.

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