NIST SP800-53 catalog with labels restored

[iMichaela]

Committer Notes

The PR fixes #237 by restoring the prop/@name="label" for backwards compatibility with previous oscal versions of the catalog. Additionally, the PR fixes #72 by removing the self-reference error in SC-12 to align with the corrected CPRT data.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you squashed any non-relevant commits and commit messages? [instructions]
• Do all automated CI/CD checks pass?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?

[iMichaela]

In the latest OSCAL version of the NIST SP 800-53 (v5.1.1+u4), each catalog has:
1.

<prop name="label" class="zero-padded" value="AC-02"/>

This was done to align with he CPRT data and promote zero-padded control IDs until v6 when we will be able to break the backwards compatibility and add those zero-padded IDs as OSCAL control IDs as well.

NOTE: This decision was made in collaboration with the community members and per @david-waltermire note that RMF team's lead is not prescriptive with respect the the accuracy of the zero-padded control IDs' representation as OSCAL IDs or as alternative identifiers. The dialog and community's input is available on OSCAL/Lobby

      <prop name="label" value="AC-2"/>

This was done to support the backwards compatibility for tools relying on the such labels fro generating human-friendly versions of the catalog.

[iMichaela]

The PR is ready for community's review, in addition to NIST team's review.

[david-waltermire]

This PR restores the non-zero-padded control labels, removing the alt-identifier properties. I reviewed a diff of the catalog and it looks good. Thank you.

[wendellpiez]

LGTM thank you

[iMichaela]

[CALL TO ACTION]: The OSCAL content PR #238 updating the NIST SP 800-53 v5.1.1 is proposing restoring of the prop/@name="label" with no zero-leading control IDs and it is adding prop/@name="label" with zero-leading control IDs. NIST team greatly appreciates community members review and approval to ensure broad acceptance of the NIST SP 800-53 v3.1.1 catalog in OSCAL.

The PR will be merged at the end of the month if no comments/objections are received.