Improve test stability

[soutaro]

This PR is to make some tests more stable.

• Replaced a fixed 10-second delay in workspace.test.ts with the new retry utility, allowing assertions to be retried for up to 30 seconds, improving reliability in the presence of asynchronous file system events.
• Increased test timeouts in testController.test.ts and workspace.test.ts to 30 and 60 seconds respectively, ensuring tests have sufficient time to complete under slow conditions.

[soutaro]

Another test is failing...

 1 failing
1) Launch integrations
with launcher mode enabled:
Error: Timeout of 120000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (d:\a\ruby-lsp\ruby-lsp\vscode\out\test\suite\launch.test.js)
at listOnTimeout (node:internal/timers:588:17)
at process.processTimers (node:internal/timers:523:7)
Error: 1 tests failed.