Support categories for in-house apps

[jkatz01]

Related issue: Resolves #35464
Also allows #35531 to be merged
Adds self-service categories for #32247

Changes:

• Move category insertion up in update installer so in house apps can use it
• Add migration for in_house_app_software_categories table
• Fix some overly wrapped errors
• Add new tests for categories
• Fix unused param in another test

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)

• If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes

Testing

• Added/updated automated tests

• Where appropriate, automated tests simulate multiple hosts and test for host isolation (updates to one hosts's records do not affect another)

• QA'd all new/changed functionality manually

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

❌ Patch coverage is 77.04918% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.14%. Comparing base (0471b8c) to head (df9edf2).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/in_house_apps.go	50.00%	5 Missing and 3 partials ⚠️
...ions/tables/20251110172137_InHouseAppCategories.go	80.00%	3 Missing and 1 partial ⚠️
ee/server/service/software_installers.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #35542      +/-   ##
==========================================
+ Coverage   66.13%   66.14%   +0.01%     
==========================================
  Files        2100     2101       +1     
  Lines      177469   177514      +45     
  Branches     7260     7260              
==========================================
+ Hits       117370   117419      +49     
+ Misses      49338    49329       -9     
- Partials    10761    10766       +5     

Flag	Coverage Δ
backend	67.79% <77.04%> (+0.01%)	⬆️

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[mna]

Looks great! Just a small DB migration comment.