Support impersonating other users for super admin

[JohnNiang]

What type of PR is this?

/kind feature
/area core
/milestone 2.20.x

What this PR does / why we need it:

This PR adds support for impersonating other users for super admin.

1. Login as super admin
2. Request POST /login/impersonate?username=xxx and the current user should be xxx
3. Request POST /logout/impersonate and the current user should be super admin

Does this PR introduce a user-facing change?

支持超级管理员切换用户身份

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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

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• OWNERS

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[codecov]

Codecov Report

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

Project coverage is 57.50%. Comparing base (60c2009) to head (c2e3c3b).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
...rity/HaloRedirectAuthenticationSuccessHandler.java	81.25%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7351      +/-   ##
============================================
+ Coverage     57.18%   57.50%   +0.32%     
- Complexity     4066     4113      +47     
============================================
  Files           721      725       +4     
  Lines         24546    24699     +153     
  Branches       1612     1636      +24     
============================================
+ Hits          14036    14204     +168     
+ Misses         9882     9843      -39     
- Partials        628      652      +24     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud