CI maintenance/improvements

[lbianchi-lbl]

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• [ ] Address intermittent Codecov upload failures
• [ ] Update all basic actions (actions/checkout, actions/setup-python, actions/upload-artifact, etc) to the latest stable version to avoid deprecation warnings
• [ ] Address race conditions in Run integration workflow causing runs to be invalidated if further reviews are added after run has already started
• [ ] Add workflows for backward compatibility and verification tests.