Add API Server Service Information to KarmadaStatus

[jabellard]

What type of PR is this?

/kind feature

What this PR does / why we need it:
This is an implementation of this proposal for adding information about the API Server service of a Karmada instance to its status.

Which issue(s) this PR fixes:
Fixes #5567
Part of #5767
Special notes for your reviewer:

Does this PR introduce a user-facing change?:

The new `ApiServerService` field added as part of the Karmada instance status can be used to reference the API Server service for that instance. This is useful for scenarios where higher level operators need to discover the API Server service of a Karmada instance  for tasks like setting up ingress traffic.

[jabellard]

@RainbowMango

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.31%. Comparing base (5cd3c1a) to head (325e3bd).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5775      +/-   ##
==========================================
+ Coverage   42.30%   42.31%   +0.01%     
==========================================
  Files         655      655              
  Lines       55756    55759       +3     
==========================================
+ Hits        23589    23597       +8     
+ Misses      30653    30649       -4     
+ Partials     1514     1513       -1     

Flag	Coverage Δ
unittests	42.31% <100.00%> (+0.01%)	⬆️

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[RainbowMango]

/assign

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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Needs approval from an approver in each of these files:

• charts/OWNERS [RainbowMango]
• operator/OWNERS [RainbowMango]
• operator/pkg/apis/OWNERS [RainbowMango]

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