Create batch dependabot reverse mirror PRs

[ProjectsByJackHe]

Description

Fixes #5536

It's a bit too tedious to re-run this script for-each dependabot PR.

On a weekly cadence, somebody is going to have to run it.

Testing

(not going to fake a dependabot pr for now)

Documentation

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.69%. Comparing base (0071278) to head (10ee45e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5883      +/-   ##
==========================================
- Coverage   86.23%   85.69%   -0.54%     
==========================================
  Files          60       60              
  Lines       18732    18732              
==========================================
- Hits        16153    16053     -100     
- Misses       2579     2679     +100     

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[mtfriesen]

I strongly suggest separation of concerns: let's let the existing script mirror one PR without any policy or query logic, and then have another PR to implement the general mirroring policy of querying, filtering, and then invoking a mirror action per PR.

One script to find them, one script to bring them all [and in the darkness bind them].