api,server: allow cleaning up vm extraconfig

[shwstppr]

Description

Fixes #9878

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.57%. Comparing base (bfc4f60) to head (6bd4f62).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...he/cloudstack/api/command/user/vm/UpdateVMCmd.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #11974   +/-   ##
=========================================
  Coverage     17.56%   17.57%           
- Complexity    15540    15553   +13     
=========================================
  Files          5909     5909           
  Lines        529045   529079   +34     
  Branches      64615    64617    +2     
=========================================
+ Hits          92933    92984   +51     
+ Misses       425657   425638   -19     
- Partials      10455    10457    +2     

Flag	Coverage Δ
uitests	3.58% <ø> (ø)
unittests	18.64% <89.65%> (+<0.01%)	⬆️

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