FMA version rollback: followup (testing, small bugfixes)

[jahzielv]

Related issue: no issue, various feedback items for #31919

Checklist for submitter

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

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

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

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.31%. Comparing base (1a84cf6) to head (ff9e7aa).
⚠️ Report is 1 commits behind head on 31919-rollback.

Files with missing lines	Patch %	Lines
ee/server/service/software_installers.go	53.84%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           31919-rollback   #40319      +/-   ##
==================================================
- Coverage           66.32%   66.31%   -0.01%     
==================================================
  Files                2455     2455              
  Lines              196904   196915      +11     
  Branches             8620     8620              
==================================================
+ Hits               130590   130591       +1     
- Misses              54482    54488       +6     
- Partials            11832    11836       +4     

Flag	Coverage Δ
backend	68.12% <57.14%> (-0.01%)	⬇️

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