Improve orphaned-content and test suite

[ScriptAutomate]

Summary

• Fixes orphaned-content check isn't discovering all orphaned files, including files that are missing from any TOCs #521
• Addresses a TODO for adding a config file for tests/orphaned-content.py
• Updated several components to newer versions throughout test suite and to make sure the Dockerfile and docker compose *
  • Updating helps address potential security advisories, such as GHSA-pc99-qmg4-rcff

I don't know enough about the standards of this repo when it comes to expectations of what is considered orphaned content, so I made assumptions that I can correct based on PR review:

• When should a file be in a TOC (always, or only sometimes?) - I assumed always
• When should a file be using relative links (always, or sometimes?) - I assumed always
• Are there certain TOC files we care about and not others (or do we care about all of them?) - I assumed we care about all of the TOCs
• Are there certain files/dirs under ./src meant to be exempt from search, etc. - I assumed the TOC files themselves are not meant to be linked to from other files

As a result, I have the following test output for orphaned-content.py in the initial PR:

Found the following unlinked 7 file(s):
./src/deployment-guides/tap.md
./src/deployment-guides/tpsm-ag-on-vsphere-dep.md
./src/partials/README.md
./src/reference-designs/tap-on-tkgi.md
./src/reference-designs/tko-data-protection.md
./src/reference-designs/tko-on-azure-hybrid.md
./src/solution-workbooks/Deploy Multi-site Spring application using Tanzu Data on TAS.md
Found the following 15 file(s) missing from the TOC(s):
./src/deployment-guides/tap.md
./src/deployment-guides/tkg-package-install.md
./src/deployment-guides/tko-saas-services.md
./src/deployment-guides/tko-to-customized-dashboard.md
./src/deployment-guides/tpsm-ag-on-vsphere-dep.md
./src/partials/README.md
./src/partials/tkg-velero-vsphere-plugin.md
./src/partials/tmc-service-account-pods.md
./src/partials/troubleshoot-supervisor.md
./src/partials/vyatta.md
./src/reference-designs/tap-on-tkgi.md
./src/reference-designs/tko-data-protection.md
./src/reference-designs/tko-on-azure-hybrid.md
./src/reference-designs/tko-saas.md
./src/solution-workbooks/Deploy Multi-site Spring application using Tanzu Data on TAS.md