As a content admin, I want data exports to include information about who made edits when possible, so that I see who contributed to changes in project data.

[rlskoeser]

testing notes

for testing you should be looking at commits on the test metadata repository here: https://github.com/Princeton-CDH/test-geniza-metadata/commits/main

• metadata exports should now only generate commits when there are changes
• commits should include co-author information

dev notes

• add functionality to manage command that syncs data exports to github to track when it was last run
• query django admin log entries to get the list of users who have contributed to the changes since last run (limit to appropriate content types)
• generate a co-author commit message including all contributors since the last time the script was run

[kseniaryzhova]

@rlskoeser works for me, closing!