[Feature] Replace the fixed smoke test startup delay with readiness-based waits

[EmmaYuan1015]

Issue description

Problem

The smoke test application startup currently waits for the VS Code workbench to become visible and then unconditionally sleeps for another 10 seconds.

This fixed delay increases the execution time of every smoke test. It also does not guarantee readiness on slower environments, while unnecessarily delaying faster environments.

Proposed change

Remove APPLICATION_INIT_SLEEP and the corresponding fixed sleep from Application.launch().

The test infrastructure should continue to rely on:

• waitForWorkbenchWindow() to detect when the VS Code workbench is available.
• Test-specific Playwright waits for commands, views, and extension UI elements.

Expected result

• Smoke tests no longer have an unconditional 10-second startup delay.
• Tests continue to wait for the UI elements they actually require.
• Overall smoke test execution time is reduced.
• TypeScript smoke test compilation continues to pass.

Validation

Run:

npm run compile-smoke-tests