Add software installer extension column to database

[iansltx]

#22044

This is distinct from the filename extension due to being based on package introspection.

Checklist for submitter

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)
• Added/updated tests
• If database migrations are included, checked table schema to confirm autoupdate
• 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).
• Manual QA for all new/changed functionality

Re: testing, will test this as part of my PR for #20404. I've tested the migration changes.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.36%. Comparing base (eaa016b) to head (48b450c).

Files with missing lines	Patch %	Lines
...rations/tables/20240905200000_UninstallPackages.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22017      +/-   ##
==========================================
+ Coverage   55.82%   65.36%   +9.53%     
==========================================
  Files        1494     1494              
  Lines      116474   116514      +40     
  Branches     3488     3488              
==========================================
+ Hits        65025    76154   +11129     
+ Misses      45203    33267   -11936     
- Partials     6246     7093     +847     

Flag	Coverage Δ
backend	66.68% <85.71%> (+10.59%)	⬆️

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[getvictor]

LGTM