chore: Hide old-typescript-hero compilation errors in CI logs

Filters out TypeScript compilation errors from old-typescript-hero submodule.

Problem:
- GitHub Actions logs filled with inversify-related errors from old extension
- Errors from old-typescript-hero/src/ioc.ts (Module 'inversify' issues)
- These errors are expected/ignored but clutter CI output

Solution:
- Added grep filter to compile-tests script
- Filters out lines containing 'old-typescript-hero/src/ioc.ts'
- Compilation still succeeds (already had --noEmitOnError false)
- Only hides old extension errors, not our actual code errors

Result:
- Clean CI logs showing only relevant information
- GitHub Actions annotations won't show old extension errors

Author: JohannesHoppe

comparison-test-harness/package.json

@@ -8,7 +8,7 @@
     "node": ">=18.0.0"
   },
   "scripts": {
-    "compile-tests": "tsc -p . --outDir out --noEmitOnError false || true",
+    "compile-tests": "tsc -p . --outDir out --noEmitOnError false 2>&1 | grep -v 'old-typescript-hero/src/ioc.ts' || true",
     "watch-tests": "tsc -p . -w --outDir out",
     "pretest": "npm run compile-tests",
     "test": "vscode-test"