Align federated daemonsets.apps.kruise.io observedGeneration semantics with its native

[whitewindmills]

What type of PR is this?
/kind feature

What this PR does / why we need it:

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 daemonsets.apps.kruise.io with `.metadata.generation` only when all members' statuses are algined with its resource template generation.

[whitewindmills]

@yike21 @RainbowMango @XiShanYongYe-Chang @veophi
PTAL

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.22%. Comparing base (15df251) to head (c493c58).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5167   +/-   ##
=======================================
  Coverage   28.22%   28.22%           
=======================================
  Files         632      632           
  Lines       43548    43548           
=======================================
+ Hits        12290    12293    +3     
+ Misses      30360    30359    -1     
+ Partials      898      896    -2     

Flag	Coverage Δ
unittests	28.22% <ø> (+<0.01%)	⬆️

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[yike21]

Thanks for your work!
/lgtm

[yike21]

Thanks for your work!
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yike21

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