Pin-cleanup on FMA delete

[cdcme]

Related issue: Resolves #48309

Deleting a Fleet-maintained app from a team now also deletes its software_title_team_pins row. Previously the pin survived the delete (the FK cascades only on title deletion, and the title row outlives the installer rows), so re-adding the app resurfaced a stale pin pointing at a version no longer cached.

Checklist for submitter

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements), JS inline code is prevented especially for url redirects, and untrusted data interpolated into shell scripts/commands is validated against shell metacharacters.

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

[claude]

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.45%. Comparing base (d8c4faa) to head (061398e).
⚠️ Report is 1 commits behind head on feat/38504-auto-update-pin-rollback-fma.

Files with missing lines	Patch %	Lines
server/datastore/mysql/software_installers.go	40.00%	3 Missing and 3 partials ⚠️
ee/server/service/software_installers.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                             Coverage Diff                             @@
##           feat/38504-auto-update-pin-rollback-fma   #48333      +/-   ##
===========================================================================
+ Coverage                                    67.36%   67.45%   +0.09%     
===========================================================================
  Files                                         3668     3668              
  Lines                                       232220   232225       +5     
  Branches                                     12401    12401              
===========================================================================
+ Hits                                        156428   156649     +221     
+ Misses                                       61790    61535     -255     
- Partials                                     14002    14041      +39     

Flag	Coverage Δ
backend	68.99% <33.33%> (+0.11%)	⬆️

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