WIP: support regex selector

[haoqing0110]

Summary

Related issue(s)

Fixes #

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: haoqing0110
Once this PR has been reviewed and has the lgtm label, please assign qiujian16 for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.78%. Comparing base (2b86b8d) to head (08ce0ba).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/placement/helpers/clusters.go	88.88%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #693      +/-   ##
==========================================
+ Coverage   63.64%   63.78%   +0.14%     
==========================================
  Files         182      183       +1     
  Lines       17634    17641       +7     
==========================================
+ Hits        11223    11253      +30     
+ Misses       5480     5460      -20     
+ Partials      931      928       -3     

Flag	Coverage Δ
unit	63.78% <90.32%> (+0.14%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[qiujian16]

I would consider a CEL based selector, which could be more flexible.
e.g. could reference a score value