fix(web-api): remove unfurl arguments from chat.startStream method

[zimeg]

Summary

This PR removes unfurl_links and unfurl_media arguments from the "chat.startStream" method to align with the backend.

Testing

Calls without these arguments should continue to succeed.

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• /docs (Documents)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (ai-apps@64a995c). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## ai-apps #1761 +/- ##
==========================================
Coverage ? 85.15% ==========================================
Files ? 115 Lines ? 13068 Branches ? 0 ==========================================
Hits ? 11128 Misses ? 1940 Partials ? 0 

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[mwbrooks]

✅ Looks good!

🧪 Since this is an unreleased method, we shouldn't be concerned about breaking any apps as well.

[zimeg]

@mwbrooks Awesome! Thanks for the kind review. IMHO removing arguments that don't exist with the API, even after released, might be considered a non-breaking change anyways since the changing method wouldn't accept the argument.

For now, I'm glad we caught this sooner! 🚢 💨