feat: allow localhost as a valid host in URL validation

[marwan562]

Description

This pull request modifies the ValidateURL function to allow localhost as a valid host. Previously, local development addresses lacking a top-level domain (like localhost or http://localhost:8080) failed the domain validation regex, which prevented users from successfully logging into local Harbor instances.

• Fixes Allow localhost as valid server address in login #783

Type of Change

Please select the relevant type.

• Bug fix
• New feature
• Refactor
• Documentation update
• Chore / maintenance

Changes

• Added an early return check for "localhost" in pkg/utils/helper.go's ValidateURL function before the strict domain regex is evaluated.
• Expanded the URL validation test suite in pkg/utils/helper_test.go to include coverage for localhost addresses using both HTTP and HTTPS schemes, as well as with and without ports.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 7.82%. Comparing base (60ad0bd) to head (b87cd21).
⚠️ Report is 123 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #785      +/-   ##
=========================================
- Coverage   10.99%   7.82%   -3.17%     
=========================================
  Files         173     270      +97     
  Lines        8671   13163    +4492     
=========================================
+ Hits          953    1030      +77     
- Misses       7612   12020    +4408     
- Partials      106     113       +7     

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[NucleoFusion]

lgtm
Thanks for the contribution