Lots of logging for chat smoke tests and enable in PR builds

[alexr00]

No description provided.

[Copilot]

Pull request overview

This PR adds extensive, best-effort diagnostics and step-by-step logging to the Copilot-related smoke test suites to make CI failures easier to debug directly from smoke-test-runner.log, without needing to download large log artifacts.

Changes:

• Added dumpFailureDiagnostics(...) helper to list Playwright artifacts, capture send-button DOM state, and tail Copilot Chat extension logs on failure.
• Wrapped Copilot Chat Sessions and Agents Window smoke tests with richer progress logging and failure catch blocks that call dumpFailureDiagnostics.
• Changed smoke test suite gating so Chat Sessions and Agents Window suites run for all non-web, non-remote qualities (not just official distributions).

Show a summary per file

File	Description
test/smoke/src/utils.ts	Adds dumpFailureDiagnostics helper for failure-time artifact enumeration and log tailing.
test/smoke/src/main.ts	Adjusts which smoke suites run based on opts/quality (notably enabling more Copilot suites).
test/smoke/src/areas/chat/chatSessions.test.ts	Adds detailed logging and calls dumpFailureDiagnostics on failures in Chat Sessions tests.
test/smoke/src/areas/agentsWindow/agentsWindow.test.ts	Adds detailed logging, a send-button selector for diagnostics, and calls dumpFailureDiagnostics on failures in Agents Window tests.

Copilot's findings

• Files reviewed: 4/4 changed files
• Comments generated: 2