support pod subresource (attach, exec, port-forward) through global proxy

[ikaven1024]

Signed-off-by: yingjinhui yingjinhui@didiglobal.com

What type of PR is this?
/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #3089

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-search`: support pod subresource (attach, exec, port-forward) through global proxy

[codecov-commenter]

Codecov Report

Merging #3098 (167e132) into master (8f83031) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master    #3098   +/-   ##
=======================================
  Coverage   44.38%   44.38%           
=======================================
  Files         208      208           
  Lines       19518    19521    +3     
=======================================
+ Hits         8663     8665    +2     
- Misses      10373    10374    +1     
  Partials      482      482           

Flag	Coverage Δ
unittests	44.38% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
.../search/proxy/framework/plugins/cluster/cluster.go	74.39% <100.00%> (+0.97%)	⬆️
pkg/search/proxy/store/util.go	92.89% <0.00%> (-0.48%)	⬇️

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[RainbowMango]

/assign @XiShanYongYe-Chang

[XiShanYongYe-Chang]

Thanks a lot!
/lgtm
/approve

We may need to cherry-pick this patch to the before release.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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[ikaven1024]

Shall I cherry-pick it to previous release? @RainbowMango

[RainbowMango]

Do you think this is a bug?

[ikaven1024]

pods attach/exec/port-forward shall be supported at the beginning design. So I think it's a bug.

[XiShanYongYe-Chang]

I think @vkukul maybe also need this patch in the previous release.

[ikaven1024]

I can't cherry pick it to release 1.3 due to we have refactor the code after 1.3: #2678

[XiShanYongYe-Chang]

I can't cherry pick it to release 1.3 due to we have refactor the code after 1.3: #2678

Looks like manual intervention is required.