fix: set XIsResourceName for immutable rule API calls during force project delete

[rakshityadav1868]

Fixes #981
When deleting a project with a numeric name using force, the immutable rule APIs were not telling Harbor to treat the value as a project name. Harbor interpreted it as an ID instead, so the CLI failed to find and remove the immutable rules. This caused repository deletion to fail with an HTTP 412 error and blocked the entire project deletion.

The fix sets XIsResourceName true on ListImmutable and DeleteImmutable API calls so Harbor correctly resolves the value as a project name, allowing projects with numeric names to be force deleted successfully.

BEFORE:

Screen.Recording.2026-06-13.at.6.31.05.PM.mp4

AFTER:

Screen.Recording.2026-06-13.at.6.35.46.PM.mp4

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 9.17%. Comparing base (60ad0bd) to head (5f0a40d).
⚠️ Report is 187 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/api/immutable_handler.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #990      +/-   ##
=========================================
- Coverage   10.99%   9.17%   -1.82%     
=========================================
  Files         173     321     +148     
  Lines        8671   16083    +7412     
=========================================
+ Hits          953    1475     +522     
- Misses       7612   14474    +6862     
- Partials      106     134      +28     

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