Replace deprecated codecov/test-results-action with codecov/codecov-action

[Copilot]

The codecov/test-results-action is deprecated. Consolidated test results upload into the existing codecov/codecov-action step, which natively supports this functionality in v5+.

Changes

• Removed the separate codecov/test-results-action step
• Added test_results_files parameter to existing codecov/codecov-action step
• Moved if: !cancelled() condition to ensure test results upload even on test failures

# Before: Two separate steps
- name: Upload coverage to Codecov
  uses: codecov/[email protected]
  with:
    flags: ${{ matrix.os-name }}

- name: Upload test results to Codecov
  if: ${{ !cancelled() }}
  uses: codecov/[email protected]
  with:
    files: ./test-results/**/*.xml

# After: Single consolidated step
- name: Upload coverage and test results to Codecov
  if: ${{ !cancelled() }}
  uses: codecov/[email protected]
  with:
    flags: ${{ matrix.os-name }}
    test_results_files: ./test-results/**/*.xml

Original prompt

Replace codecov/test-results-action with codecov/codecov-action as the former is now deprecated.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.64%. Comparing base (95aefc6) to head (2f5c894).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1854      +/-   ##
==========================================
- Coverage   78.75%   78.64%   -0.11%     
==========================================
  Files         150      150              
  Lines        3733     3733              
  Branches      537      537              
==========================================
- Hits         2940     2936       -4     
- Misses        546      550       +4     
  Partials      247      247              

Flag	Coverage Δ
linux	78.59% <ø> (-0.11%)	⬇️
macos	57.40% <ø> (-0.06%)	⬇️
windows	57.46% <ø> (ø)

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