Update @github/copilot to 1.0.28 (#1089)

- Updated nodejs and test harness dependencies
- Re-ran code generators
- Formatted generated code

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

dotnet/src/Generated/Rpc.cs

@@ -56,7 +56,7 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@github/copilot": "^1.0.27",
+    "@github/copilot": "^1.0.28",
     "vscode-jsonrpc": "^8.2.1",
     "zod": "^4.3.6"
   },