feat: bofreq timestamp fixup task

[jennifer-richards]

Adds a task to fix DocEvent, DocHistory, and Document timestamps for bofreqs affected by #5893. That was fixed for new uploads by #10333 - this fixes up the existing data.

Creates a task to be run once. In dev, takes less than 10 seconds. Emits some ugly logs that record exactly what was touched. A DocEvent comment is added to the Document's history indicating that the fixup occurred and identifying the affected revisions.

Fixes #5893

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.35%. Comparing base (4a024d9) to head (91a00f2).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10402      +/-   ##
==========================================
- Coverage   88.37%   88.35%   -0.02%     
==========================================
  Files         325      325              
  Lines       43638    43653      +15     
==========================================
+ Hits        38563    38571       +8     
- Misses       5075     5082       +7     

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