fix: update the oscal-samples demo to use the latest trestle

[Ma1h01]

Description

1. Resolved https://github.com/oscal-compass/compliance-trestle-demos/issues/41
2. Updated the Makefile to install the latest trestle version and activate the virtual environment for make help
3. Fixed importing the deprecated module in k8s-to-oscal.py
4. Created a helper function to indicate whether the YAML file is valid in k8s-to-oscal.py, and only parse those are valid.

[linux-foundation-easycla[bot]]

• :white_check_mark:login: Ma1h01 / (fa4f44161702d0e7ba7a56d6779d5058a9a8afcc)

The committers listed above are authorized under a signed CLA.

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/lifecycle stale

[JimBugwadia]

/remove-lifecycle stale

[JimBugwadia]

/lgtm /approve

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This pull-request has been approved by: JimBugwadia, Ma1h01

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