Add issue-1043 Constraints

[Gabeblis]

Committer Notes

Purpose

This PR aims to add the inventory-item-has-diagram-label and component-has-diagram-label constraints which help ensure that there is a "diagram-label" prop in each inventory item or "hardware", "software", "service", or "interconnection" component that isn't linked to an inventory item.

Changes

Added constraints:

• inventory-item-has-diagram-label
• component-has-diagram-label

Added valid/invalid test content:

• ssp-inventory-item-has-diagram-label-INVALID.xml
• ssp-component-has-diagram-label-INVALID.xml
• Edited fedramp-ssp-example.oscal.xml to align with constraints.

Added yaml files for testing:

• Pass/fail yaml tests added for each of the above constraints.

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• Have you added an explanation of what your changes do and why you'd like us to include them?
• If applicable, have all FedRAMP Documents Related to OSCAL Adoption affected by the changes in this issue have been updated.?
• If applicable, does this PR reference the issue it addresses and explain how it addresses the issue?

By submitting a pull request, you are agreeing to provide this contribution under the CC0 1.0 Universal public domain dedication.

[Rene2mt]

Approved!! Just needs a final rebase before merging.