Update Codecov test-results upload to supported action path

[Copilot]

The CI run surfaced a deprecated Codecov test-results path (codecov/test-results-action@v1) and Node 20 deprecation warnings for that action. This PR updates the Codecov pipeline usage to the current supported invocation.

• What changed

  • Replaced the dedicated test-results action:
    • codecov/test-results-action@v1
  • With codecov/codecov-action@v5 configured for test results upload.

• Workflow impact

  • Keeps coverage upload step unchanged.
  • Moves test-results reporting onto the maintained codecov-action path (report_type: test_results) to align with Codecov’s deprecation guidance.

• Patch excerpt

  - name: Upload test results to Codecov
    if: ${{ !cancelled() }}
    uses: codecov/codecov-action@v5
    with:
      token: ${{ secrets.CODECOV_TOKEN }}
      report_type: test_results

[justinchuby]

@copilot cherrypick the fix and rebase from main

[Copilot]

@copilot cherrypick the fix and rebase from main

Done in 8ad6041a. I removed the unrelated changes so this PR now diffs only the Codecov fix against main.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.64%. Comparing base (00de62e) to head (8ad6041).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2970   +/-   ##
=======================================
  Coverage   72.64%   72.64%           
=======================================
  Files         265      265           
  Lines       32192    32192           
  Branches     3038     3038           
=======================================
  Hits        23385    23385           
  Misses       7776     7776           
  Partials     1031     1031           

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