Fix batch set installers not updating some fields

[jkatz01]

Related issue: Resolves #40549
Fix some settings like setup experience, self service, scripts, not being updated in BatchSetSoftwareInstallers

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

• Tested that unlocked version FMA setup experience, self service, or script changes appropriately

• Tested with version locked FMA

For unreleased bug fixes in a release candidate, one of:

• Confirmed that the fix is not expected to adversely impact load test results
• Alerted the release DRI if additional load testing is needed

[jkatz01]

I believe TestGetAssets failing is unrelated as it fails on main for me locally too.

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.29%. Comparing base (f555071) to head (f264cb1).
⚠️ Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
server/datastore/mysql/software_installers.go	92.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #40631   +/-   ##
=======================================
  Coverage   66.28%   66.29%           
=======================================
  Files        2466     2466           
  Lines      197534   197570   +36     
  Branches     8601     8601           
=======================================
+ Hits       130945   130987   +42     
+ Misses      54740    54733    -7     
- Partials    11849    11850    +1     

Flag	Coverage Δ
backend	68.18% <92.00%> (+0.01%)	⬆️

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