Add Datadog code coverage upload

[ManuelPalenzuelaDD]

What does this PR do?

We're migrating Datadog repositories from Codecov to Datadog Code Coverage for tracking test coverage. This PR is the first step: it adds a Datadog coverage upload alongside the existing Codecov upload so we can run both systems in parallel and verify parity before switching over.

Changes

• Added DataDog/coverage-upload-github-action step to the Coverage job in actions.yml, immediately after the existing Codecov upload
• Mirrors the existing Codecov flags (unittests) via the flags: parameter
• Coverage format: JaCoCo XML (auto-discovered)
• The existing Codecov uploads are unchanged — nothing is removed or modified
• The upload uses if: always() and continue-on-error: true so it cannot block CI

Why are we doing this?

As part of a company-wide effort, we're consolidating code coverage reporting into Datadog's own Code Coverage product. This gives us:

• Coverage data integrated directly into Datadog CI Visibility
• PR gates and coverage checks natively in Datadog
• No dependency on a third-party service (Codecov) for coverage reporting

Validation

Pending — CI will run with secrets now that this PR is from origin.

Next steps (not in this PR)

Once this PR is merged and we've confirmed Datadog coverage is stable over several commits:

1. Remove the Codecov upload steps and CODECOV_TOKEN secret
2. Optionally configure PR gates in code-coverage.datadog.yml

No action needed from reviewers beyond normal review

This is a low-risk, additive change. The new upload step runs independently of the existing CI pipeline and cannot cause test failures.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.55%. Comparing base (47c2db6) to head (9f16ff8).
⚠️ Report is 73 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #193      +/-   ##
============================================
- Coverage     58.55%   57.55%   -1.01%     
- Complexity      134      175      +41     
============================================
  Files            34       34              
  Lines          3458     3645     +187     
  Branches        780      819      +39     
============================================
+ Hits           2025     2098      +73     
- Misses          900      973      +73     
- Partials        533      574      +41     

Flag	Coverage Δ
helper	57.55% <ø> (-1.01%)	⬇️

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[datadog-datadog-prod-us1-2]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 57.28%

_{This comment will be updated automatically if new data arrives.
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