feat(amazonq): add admin control for MCP servers to block usage (#7937)

## Problem
New feature for mcp admin control needs changelog

## Solution
- Added changelog


---

- 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: ashishrp-aws

packages/amazonq/.changes/next-release/Feature-5e9de7e7-cf7b-4ed3-824f-062b82b3f4b9.json

@@ -0,0 +1,4 @@
+{
+	"type": "Feature",
+	"description": "Amazon Q supports admin control for MCP servers to restrict MCP server usage"
+}