Clarify interpreter webhook service discovery usage

[XiShanYongYe-Chang]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

In order to guide users to better use the resource interpreter webhook, the configuration description of clientConfig is added, and the directory description is also added.

Which issue(s) this PR fixes:
Fixes #5958

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.24%. Comparing base (8d89d77) to head (463154b).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5969      +/-   ##
==========================================
+ Coverage   48.17%   48.24%   +0.07%     
==========================================
  Files         664      664              
  Lines       54799    54749      -50     
==========================================
+ Hits        26399    26415      +16     
+ Misses      26684    26620      -64     
+ Partials     1716     1714       -2     

Flag	Coverage Δ
unittests	48.24% <ø> (+0.07%)	⬆️

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[XiShanYongYe-Chang]

/cc @RainbowMango @lxtywypc

[lxtywypc]

And another point I'm not sure, if we could deploy the load balancer through karmada-apiserver?

Others LGTM.

[XiShanYongYe-Chang]

And another point I'm not sure, if we could deploy the load balancer through karmada-apiserver?

This test has not been performed. I understand that the cluster IP address in the service of karmada-apiserver should be fake. NodePort or LoadBalancer depend on this cluster IP address and cannot be accessed.

[RainbowMango]

/assign

[RainbowMango]

/retitle Clarify interpreter webhook service discovery usage

[RainbowMango]

/lgtm
/approve

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