Align federated StatefulSet's observedGeneration semantics with its native

[zhy76]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Align federated StatefulSet's observedGeneration semantics with its native

Which issue(s) this PR fixes:
Part of #4870

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-controller-manager`: Mark `.status.observedGeneration` of StatefulSet with `.metadata.generation` only when all members' statuses are algined with its resource template generation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.21%. Comparing base (45d4b8e) to head (d7d28ea).
Report is 9 commits behind head on master.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5094      +/-   ##
==========================================
- Coverage   28.22%   28.21%   -0.02%     
==========================================
  Files         632      632              
  Lines       43551    43554       +3     
==========================================
- Hits        12292    12287       -5     
- Misses      30363    30369       +6     
- Partials      896      898       +2     

Flag	Coverage Δ
unittests	28.21% <ø> (-0.02%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yike21]

Thanks for your contribution!
Generally LGTM.

Please push the code again to pass CI.

[RainbowMango]

/retest

@yike21
You can use the restest command now.

[XiShanYongYe-Chang]

This field does not appear to be available in the Advanced Statefulset status: https://github.com/openkruise/kruise/blob/8ae13b1b818f4b46f9317a0ce8c806bcfe4fdc00/apis/apps/v1beta1/statefulset_types.go#L267

[XiShanYongYe-Chang]

ditto

[zhy76]

Thanks~fixed

[yike21]

Thanks!
/lgtm

[XiShanYongYe-Chang]

Thanks
/lgtm

[RainbowMango]

/assign @chaunceyjiang
for approval

[RainbowMango]

/approve

[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:

• pkg/resourceinterpreter/default/thirdparty/OWNERS [RainbowMango]

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