Drop duplicate MySQL indexes.

[getvictor]

#24109
Duplicate indexes identified after running pt-duplicate-key-checker
https://docs.percona.com/percona-toolkit/pt-duplicate-key-checker.html

Checklist for submitter

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• For database migrations:
  • Checked schema for all modified table for columns that will auto-update timestamps during migration.
  • Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
  • Ensured the correct collation is explicitly set for character columns (COLLATE utf8mb4_unicode_ci).

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 5 lines in your changes missing coverage. Please review.

Project coverage is 63.41%. Comparing base (3b64f10) to head (0148f7b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ns/tables/20241122171434_RemoveDuplicateIndexes.go	95.23%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24107      +/-   ##
==========================================
- Coverage   63.42%   63.41%   -0.01%     
==========================================
  Files        1579     1580       +1     
  Lines      149950   150143     +193     
  Branches     3782     3782              
==========================================
+ Hits        95106    95217     +111     
- Misses      47262    47341      +79     
- Partials     7582     7585       +3     

Flag	Coverage Δ
backend	64.28% <95.23%> (-0.01%)	⬇️

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