Tutorials timesstamps

[brcolli]

Fixes #2848

Description

I wrote a script that goes to each .py and .rst file in beginner_source, intermediate_source, and advanced_source directories. It looks for the first line containing "Author: ..." or "Authors: ..." and then inserts "Updated: HH:MM AM/PM, mm dd, yyyy" format. If this line isn't found, it adds it to the end of the file.

The timestamp is generated by looking at git logs for the specific file and seeing when it was last committed.
Alternative solution was looking at last modified time for the file, but that isn't concrete or modular.
Another possible alternative is adding a check in the pipeline to ensure the user manually inserts the line before they commit. This is the safest but least user friendly.

I created a .sh script to get called during the build-tutorials workflow. It is placed at the very beginning of the manager job or right before running make docs in the worker job.
This does add a few seconds to the build time, but nothing major.

I was able to test this on my forked repo with a simple runner, but I obviously couldn't test this in your dedicated pipeline.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

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