Fix Codecov upload breaking CI when CODECOV_TOKEN is not configured

[Copilot]

Codecov upload step fails with {"message":"Repository not found"} when CODECOV_TOKEN secret is absent, and fail_ci_if_error: true propagates that failure to the entire workflow.

Changes

• if: ${{ secrets.CODECOV_TOKEN }} — skips the upload step entirely when the secret is not set
• fail_ci_if_error: false — prevents Codecov errors from blocking CI even if the step runs

- name: Upload coverage to Codecov
  uses: codecov/codecov-action@v5
  if: ${{ secrets.CODECOV_TOKEN }}
  with:
    token: ${{ secrets.CODECOV_TOKEN }}
    files: ./coverage.xml
    flags: unittests
    name: codecov-umbrella
    fail_ci_if_error: false

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