chore: remove find_github_backup_info.py

[jennifer-richards]

Plan is to move this to a separate app instead of being part of datatracker.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.76%. Comparing base (ea8377d) to head (d520b3d).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9307      +/-   ##
==========================================
+ Coverage   88.74%   88.76%   +0.01%     
==========================================
  Files         320      320              
  Lines       41674    41689      +15     
==========================================
+ Hits        36985    37005      +20     
+ Misses       4689     4684       -5     

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