Add LB service to Custom Netris VPC/Network offerings

[Pearl1594]

Description

This PR adds LB service to Network and VPC offerings (in NAT mode) created for Netris Provider

Fixes: #11411

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 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.35%. Comparing base (7d59bfe) to head (0438189).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...ommand/admin/network/CreateNetworkOfferingCmd.java	0.00%	4 Missing ⚠️
...ck/api/command/admin/vpc/CreateVPCOfferingCmd.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11410      +/-   ##
============================================
- Coverage     17.35%   17.35%   -0.01%     
+ Complexity    15232    15229       -3     
============================================
  Files          5885     5885              
  Lines        525618   525622       +4     
  Branches      64157    64161       +4     
============================================
- Hits          91225    91213      -12     
- Misses       424094   424113      +19     
+ Partials      10299    10296       -3     

Flag	Coverage Δ
uitests	3.63% <ø> (ø)
unittests	18.39% <0.00%> (-0.01%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud