Proxy connect get cluster impersonator secret use secretLister

[yanfeng1992]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

When using the proxy function provided by karmada-aggregated-apiserver to access member cluster resources. The current implementation needs to obtain the impersonator secret corresponding to the member cluster in real time each time.

In large-scale scenarios, the number of requests to karmada-apiserver will increase, and I think cached queries should be used

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[zishen]

Good job, and you will add relevant test cases later, right?

[XiShanYongYe-Chang]

Thanks~
/assign

The UT run failed, can you help take a look?

[codecov-commenter]

Codecov Report

Merging #3947 (c30e6e6) into master (1953a0e) will decrease coverage by 0.14%.
Report is 41 commits behind head on master.
The diff coverage is 75.00%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##           master    #3947      +/-   ##
==========================================
- Coverage   54.85%   54.71%   -0.14%     
==========================================
  Files         229      229              
  Lines       21927    22079     +152     
==========================================
+ Hits        12027    12080      +53     
- Misses       9261     9353      +92     
- Partials      639      646       +7     

Flag	Coverage Δ
unittests	54.71% <75.00%> (-0.14%)	⬇️

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

Files Changed	Coverage Δ
pkg/registry/cluster/storage/storage.go	0.00% <0.00%> (ø)
pkg/registry/cluster/storage/proxy.go	65.38% <100.00%> (+6.29%)	⬆️

... and 6 files with indirect coverage changes

[yanfeng1992]

I added UT @XiShanYongYe-Chang @zishen

[XiShanYongYe-Chang]

Thanks a lot

[XiShanYongYe-Chang]

Thanks~
/lgtm

[yanfeng1992]

cc @RainbowMango

[RainbowMango]

@XiShanYongYe-Chang Are you waiting for me to take a look?

[XiShanYongYe-Chang]

@XiShanYongYe-Chang Are you waiting for me to take a look?

Hi @RainbowMango we need you to approve the merge request.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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

The pull request process is described here

Needs approval from an approver in each of these files:

• cmd/aggregated-apiserver/OWNERS [RainbowMango]
• pkg/aggregatedapiserver/OWNERS [RainbowMango]
• pkg/registry/OWNERS [RainbowMango]

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