SG-45337 Make Codecov checks advisory

[julien-lang]

tk-toolchain's codecov.yml only configured the project status, leaving patch on Codecov's default, so codecov/patch failed and blocked PRs whenever the changed lines were not exercised by unit tests (e.g. setup.py, conf.py, mechanical refactors). This mirrors the tk-core SG-43838 pattern to make the Codecov checks advisory.

Changes

• Make both the project and patch Codecov statuses informational: true (report, never block CI).
• Set an 80% target on both, plus a 1% project threshold to ignore small-change noise.
• Keep the existing only_pulls: true on the project status.

Reference

• SG-43838 Make Codecov checks advisory with 80% threshold tk-core#1109

Testing

• Config-only change; Codecov continues to report coverage but no longer fails the check.

[Copilot]

🟢 Approval recommended

No unresolved review issues were identified.

Pull request overview

Updates Codecov configuration so coverage checks report results without blocking pull requests.

Changes:

• Makes project and patch statuses informational.
• Sets 80% coverage targets and a 1% project threshold.
• Preserves only_pulls: true.

File summaries

File	Description
codecov.yml	Configures advisory project and patch coverage checks.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.13%. Comparing base (b3e4374) to head (47ccbd8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #89   +/-   ##
=======================================
  Coverage   44.13%   44.13%           
=======================================
  Files          18       18           
  Lines         639      639           
=======================================
  Hits          282      282           
  Misses        357      357           

Flag	Coverage Δ
Linux	43.66% <ø> (ø)
Python-3.10	43.66% <ø> (ø)
Python-3.11	44.13% <ø> (ø)
Python-3.13	44.13% <ø> (ø)
Python-3.9	43.66% <ø> (ø)
Windows	43.64% <ø> (ø)
macOS	43.81% <ø> (ø)

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