fix: CVE Allowlist Validation

[bupd]

Comprehensive Summary of your change

This PR only adds validation for CVE Allowlist and does not impact any logic.

• fixes validation for empty and cves with only spaces
• Added Tests

Issue being fixed

Fixes #21882

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/update"
• 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 65.86%. Comparing base (c8c11b4) to head (84053da).
Report is 491 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22077       +/-   ##
===========================================
+ Coverage   45.36%   65.86%   +20.50%     
===========================================
  Files         244     1071      +827     
  Lines       13333   115799   +102466     
  Branches     2719     2925      +206     
===========================================
+ Hits         6049    76276    +70227     
- Misses       6983    35291    +28308     
- Partials      301     4232     +3931     

Flag	Coverage Δ
unittests	65.86% <100.00%> (+20.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/pkg/allowlist/validator.go	90.90% <100.00%> (ø)
...eft-side-nav/config/security/security.component.ts	60.25% <100.00%> (+16.25%)	⬆️
...t-policy-config/project-policy-config.component.ts	52.65% <100.00%> (+3.90%)	⬆️
src/portal/src/app/shared/services/interface.ts	72.72% <ø> (ø)

... and 981 files with indirect coverage changes

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[bupd]

/label "release-note/update", "area/ui"

[stonezdj]

@bupd could you please squash all commits together?