Automate file uploading to a common knowledge documents repo

[nerdalert]

• Adds a drag-and-drop file upload (PDF, Markdown)
• Creates a signed PR with user uploaded documents into a forked upstream template docs repo and captures the commit SHA that is maintained with a merge commit. The SHA and file names are then populated back into the knowledge submission form.

Tracked by #4

• Workflow diagram:

[nerdalert]

WIP PoC demo video:

https://github.com/instructlab/ui/assets/1711674/d8ba91ae-3697-40e1-b76b-41ef1fb62012

The test repos in the demo:

• Mock taxonomy repo https://github.com/brents-pet-robot/taxonomy-sub-testing/pulls
• Mock taxonomy data store repo https://github.com/nerdalert/taxonomy-document-store

[nerdalert]

• [x] adjust the knowledge doc fork files to be timestamped for uniqueness in the case the user re-uploads the docs so the commit diff will show the file.
• [x] docs dir forks a central repo template from instructlab. This maintains some consistency but avoids instructlab repos from storing knowledge docs in ilab repos.
• [x] resolve the scenario where a user uses ssh keys for commits
• [x] resolve the race condition that occurs on the first run where the upstream repos need to be forked. Added a delay before retrieving the base SHA.
• [ ] schema version missing from the submission