ci: post regression notifications if scheduled tests do not succeed

[zimeg]

Summary

This PR follows #1374 and #1375 to send regression notifications if scheduled tests do not succeed instead of just during failures. Fixes an issue where test timeout did not post a message.

Testing

📺 Planning to add a few commits that confirm !success is the correct operation for both "cancelled" and "failure" states. Since these steps run when scheduled on "main" outside of this PR, these are both events we want to capture I believe.

Category

• Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• 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 ./scripts/install_all_and_run_tests.sh after making the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.00%. Comparing base (9fa6e86) to head (e768b0c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #1376 +/- ##
=======================================
Coverage 91.00% 91.00% =======================================
Files 222 222 Lines 7512 7512 =======================================
Hits 6836 6836 Misses 676 676 

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[zimeg]

📚 Reference: https://docs.github.com/en/actions/reference/workflows-and-actions/expressions#status-check-functions

[mwbrooks]

Great idea!

[zimeg]

@mwbrooks Kind appreciation in the iterations against regression - let's now merge this! 🤖