fix(workspace): remove non-flare workspace lsp (aws#7359)

## Problem
The workspace LSP has been merged into the Amazon Q LSP (Flare). There
is no need to keep the non-flare workspace LSP, it will consume both CPU
and memory once it starts to index. This will make non agentic chat
experience not having `@file` or `@workspace ` but at this point we want
customers to use agentic chat. As such CPU and memory usage problem is
of higher priority.

## Solution
remove: disable workspace lsp

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: leigaol

packages/amazonq/.changes/next-release/Removal-951c2b6a-c6ce-45df-95d0-381ca51b935f.json

@@ -0,0 +1,4 @@
+{
+	"type": "Removal",
+	"description": "Disable local workspace LSP"
+}