Improved error message when trying to apply CAs via gitops without a premium license

[ghernandez345]

Related issue: Resolves #35645

This changes the error message for an invalid license when trying to apply certificate authorities via GitOps

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
• Added/updated automated tests
• QA'd all new/changed functionality manually

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.14%. Comparing base (5b5a3e5) to head (a287482).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
server/service/client.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #37981      +/-   ##
==========================================
+ Coverage   62.75%   64.14%   +1.38%     
==========================================
  Files        2197     2385     +188     
  Lines      172921   190020   +17099     
  Branches     8429     8429              
==========================================
+ Hits       108523   121888   +13365     
- Misses      54013    56879    +2866     
- Partials    10385    11253     +868     

Flag	Coverage Δ
backend	65.72% <60.00%> (+1.44%)	⬆️

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[ghernandez345]

Ignoring failing test as this is a known unrelated test failure being fixed elsewhere