admin/enqueue_job: Add sync_to_git/sparse_index subcommands

[Turbo87]

#9551 slightly changed how features are serialized in the index. We know about a couple of cases that we want to fix, so this PR adds an option for us to manually trigger an index sync.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 89.10%. Comparing base (2d33f01) to head (3567bbd).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/admin/enqueue_job.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9577      +/-   ##
==========================================
- Coverage   89.11%   89.10%   -0.02%     
==========================================
  Files         287      287              
  Lines       29051    29057       +6     
==========================================
  Hits        25890    25890              
- Misses       3161     3167       +6     

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