test(lsp): add initialization tests for installed servers

[bajrangCoder]

Closes: #2511

[greptile-apps]

Greptile Summary

This PR adds initialization tests for installed LSP servers. The main changes are:

• Checks server installation before starting each test.
• Starts a runtime and validates the LSP initialize response.
• Adds per-test timeouts and connection cleanup.
• Registers the LSP suite with the test runner.

Confidence Score: 5/5

This looks safe to merge.

• The missing-server branch exits through the runner's skip mechanism.
• No blocking issues remain in the updated code.

Important Files Changed

Filename	Overview
src/test/lsp.tests.js	Adds installation checks, runtime startup, initialization validation, timeouts, and cleanup for LSP server tests.
src/test/test-definitions.js	Registers the new LSP initialization test suite.
src/test/tester.js	Adds per-test timeout support and refreshes suite registration before reruns.

_{Reviews (2): Last reviewed commit: "fix" | Re-trigger Greptile}