lazy load v2_swagger_client module

[MinerYang]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

lazy load v2_swagger_client module when running Setup robot case before swagger file generated.

Issue being fixed

#22123

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.88%. Comparing base (c8c11b4) to head (71cc70c).
Report is 505 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22154       +/-   ##
===========================================
+ Coverage   45.36%   65.88%   +20.51%     
===========================================
  Files         244     1072      +828     
  Lines       13333   115713   +102380     
  Branches     2719     2925      +206     
===========================================
+ Hits         6049    76238    +70189     
- Misses       6983    35249    +28266     
- Partials      301     4226     +3925     

Flag	Coverage Δ
unittests	65.88% <ø> (+20.51%)	⬆️

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see 986 files with indirect coverage changes

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[Copilot]

Pull Request Overview

This PR introduces lazy loading of the v2_swagger_client module via importlib to avoid import errors before the Swagger client is generated. It replaces direct imports and references with calls to a local swagger_module helper.

• Added a swagger_module helper function and replaced direct v2_swagger_client imports with dynamic imports in three modules.
• Updated API client instantiations and exception handling to use the dynamically loaded module.
• Removed direct imports of v2_swagger_client and commented out the static ApiException import.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
tests/apitests/python/testutils.py	Added swagger_module helper and replaced direct v2_swagger_client calls.
tests/apitests/python/library/repository.py	Introduced dynamic import helper; updated API calls and exception handling.
tests/apitests/python/library/base.py	Added swagger_module helper; updated client creation to use dynamic import.

[chlins]

lgtm

[wy65701436]

lgtm