Refactor: Modularize ApiResponseHelper#createUsageResponse (4.22 Backport)

[PrashantBhanage]

Note: This is the 4.22 LTS backport of PR #13490 as requested by @DaanHoogland.

Fixes #11635

Description

This PR addresses the technical debt in ApiResponseHelper#createUsageResponse(Usage) by modularizing the 530-line method.

• Extracted the 500+ line switch/if-else block into a main dispatcher method populateUsageTypeSpecificDetails.
• Created 18 individual private helper methods for each specific UsageType to improve maintainability and readability.
• Introduced a UsageResourceDetails container class to safely manage and return resourceId and resourceType state for tag lookups.
• Verified zero business logic changes; strictly structural refactoring.
• Note: The JUnit 5 test migration from the original main PR has been intentionally excluded from this backport to avoid framework conflicts with the stable 4.22 LTS testing architecture.

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):

N/A (Pure backend refactoring)

How Has This Been Tested?

• Verified structural integrity locally.
• Fixed .toString() type mismatch in usage entity lookups to ensure Simulator CI passes cleanly on the LTS branch.

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

This is a pure structural refactor. Carefully verified that no business logic, string formatting, or calculations were altered.

[codecov]

Codecov Report

❌ Patch coverage is 1.88235% with 417 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.69%. Comparing base (0339f31) to head (ffa7089).

Files with missing lines	Patch %	Lines
...src/main/java/com/cloud/api/ApiResponseHelper.java	1.88%	395 Missing and 22 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.22   #13695      +/-   ##
============================================
- Coverage     17.69%   17.69%   -0.01%     
- Complexity    15833    15834       +1     
============================================
  Files          5925     5925              
  Lines        533534   533626      +92     
  Branches      65273    65281       +8     
============================================
- Hits          94421    94416       -5     
- Misses       428434   428533      +99     
+ Partials      10679    10677       -2     

Flag	Coverage Δ
uitests	3.69% <ø> (ø)
unittests	18.77% <1.88%> (-0.01%)	⬇️

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[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 18672

[PrashantBhanage]

Hey @DaanHoogland, checked the Build log, no actual BUILD FAILURE anywhere, every module shows 0 errors/failures. It never even reached the server module where ApiResponseHelper lives, still stuck around module 119/158 in unrelated plugins when it got cut off around 17m. Looks like it just hit a timeout and got cancelled mid run, not a real failure. Don't have re-run rights on my end, could you kick it off again?

[DaanHoogland]

@blueorangutan test

[blueorangutan]

@DaanHoogland a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian Build Failed (tid-16617)