remote: T7940: Add subdirectory support for git commit archiving

[scj643]

Change summary

Add the option to allow subdirectories to be used for the git commit-archive location.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T7940

How to test / Smoketest result

Add a git config with an extra subdirectory path after the config object.

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

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PR title does not match the required format

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[scj643]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests VPP 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• Config tests VPP 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed

[scj643]

I think this will need to actually become https://vyos.dev/T6304 in order to actually make it easy to implement.