Chore: add CoreOptions flags test

[yyzxw]

Description of your changes

🤖 Generated by Copilot at 5e8b737

Summary

🧪🚩🎛️

Add unit test for CoreOptions struct in cmd/core/app/options/options_test.go. The test verifies that the struct can parse and store the core controller flags correctly. The test is part of a refactoring effort to improve the core controller configuration.

CoreOptions test
Parsing and storing flags well
Autumn of refactor

Walkthrough

• Add a new test file for the CoreOptions struct and its Flags method (link). The test file options_test.go verifies that the CoreOptions struct can parse and store the command-line flags for the core controller, such as metrics-addr, enable-leader-election, and webhook-cert-dir. The test file is located in the same package as the CoreOptions struct and follows the naming convention of options_test.go. The test file also includes the license header and the necessary imports for the test.

add unit test for CoreOptions.Flags().

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (1b9bdff) 60.96% compared to head (767e269) 60.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6007      +/-   ##
==========================================
+ Coverage   60.96%   60.99%   +0.02%     
==========================================
  Files         225      225              
  Lines       31345    31345              
==========================================
+ Hits        19111    19119       +8     
+ Misses      10469    10456      -13     
- Partials     1765     1770       +5     

Flag	Coverage Δ
core-unittests	56.00% <ø> (+0.01%)	⬆️
e2e-multicluster-test	25.05% <ø> (+0.01%)	⬆️
e2etests	25.30% <ø> (+0.03%)	⬆️

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see 9 files with indirect coverage changes

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[yyzxw]

/retest