NSX: Cleanup PF rule when VM is expunged and fix UDP - LB rules

[Pearl1594]

Description

This PR...

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

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

Attention: Patch coverage is 25.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 32.34%. Comparing base (8c7c59f) to head (5a74c3e).
Report is 30 commits behind head on nsx-integration.

Files	Patch %	Lines
...va/org/apache/cloudstack/service/NsxApiClient.java	0.00%	2 Missing ⚠️
...java/org/apache/cloudstack/service/NsxElement.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             nsx-integration    #8699      +/-   ##
=====================================================
+ Coverage              30.89%   32.34%   +1.44%     
- Complexity             33460    36519    +3059     
=====================================================
  Files                   5388     5391       +3     
  Lines                 377567   396121   +18554     
  Branches               55032    62659    +7627     
=====================================================
+ Hits                  116664   128121   +11457     
- Misses                245401   251084    +5683     
- Partials               15502    16916    +1414     

Flag	Coverage Δ
simulator-marvin-tests	26.19% <0.00%> (+1.65%)	⬆️
uitests	4.68% <ø> (+0.32%)	⬆️
unit-tests	16.83% <25.00%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Pearl1594]

Already present in #7919