SG-43838 Make Codecov checks advisory with 80% threshold

[stevelittlefish]

Summary

• Sets informational: true on both project and patch Codecov checks so CI is never blocked by coverage warnings
• Sets target: 80% on both checks — Codecov only annotates when coverage genuinely drops below 80%
• Adds a threshold: 1% on the project check to suppress noise from small changes

Context

The previous configuration had no coverage.status section, so Codecov was using its defaults: patch check requires 100% of new lines covered, and failures block CI. This meant a PR adding 3 lines of code with 1 uncovered line would fail CI with a 66% coverage warning — despite the uncovered line being untestable or trivial.

With these changes:

• Coverage is visible and reported in PR comments as before
• CI is never red due to coverage alone
• Codecov will still flag (advisorily) if coverage drops meaningfully below 80%

Test plan

• Verify Codecov status checks show as informational (green) on this PR regardless of patch coverage
• Confirm Codecov PR comment still reports coverage data

Jira: SG-43838

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.46%. Comparing base (c6204cc) to head (67aa36f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1109   +/-   ##
=======================================
  Coverage   79.45%   79.46%           
=======================================
  Files         206      206           
  Lines       21007    21007           
=======================================
+ Hits        16692    16694    +2     
+ Misses       4315     4313    -2     

Flag	Coverage Δ
Linux	78.93% <ø> (ø)
Python-3.10	79.28% <ø> (ø)
Python-3.11	79.18% <ø> (ø)
Python-3.13	79.18% <ø> (ø)
Python-3.9	79.25% <ø> (+<0.01%)	⬆️
Windows	78.97% <ø> (+<0.01%)	⬆️
macOS	78.94% <ø> (ø)

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[Copilot]

Pull request overview

Updates the repository’s Codecov configuration so coverage status checks become advisory (non-blocking) while still highlighting meaningful coverage drops below an 80% target.

Changes:

• Adds coverage.status configuration for both project and patch checks.
• Marks both checks as informational: true so coverage warnings don’t fail CI.
• Sets target: 80% for both checks and adds threshold: 1% for project coverage to reduce noise from small fluctuations.

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