Add inventory-item-has-is-scanned Constraint

[Gabeblis]

Committer Notes

Purpose

This PR aims to add the inventory-item-has-is-scanned constraint which ensures that each inventory item, or it's linked component, has the "is-scanned" prop that states if it is included in scans or not.

Changes

Added constraint:

• inventory-item-has-is-scanned

Added valid/invalid test content:

• ssp-inventory-item-has-is-scanned-INVALID.xml
• Edited fedramp-ssp-example.oscal.xml to align with constraint

Added yaml files for testing:

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

All Submissions:

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• 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]
• 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]

Looks good to me!

[Rene2mt]

@Gabeblis would you mind updating this PR? I resolved the merge conflict after approving it but may have put the constraint in the wrong locations so now its failing some of the style guide tests.

[Gabeblis]

@Gabeblis would you mind updating this PR? I resolved the merge conflict after approving it but may have put the constraint in the wrong locations so now its failing some of the style guide tests.

I fixed the rebase 🫡