fix: Sync workload's status.observedGeneration if it's updated

[jwcesign]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Referring to #4137
When the deployment is updated in spe, we need to trigger the status update. To resolve the inconsistent generation.

Which issue(s) this PR fixes:
Fixes #4137

Special notes for your reviewer:
none

Does this PR introduce a user-facing change?:

`karmada-controller-manager`: Fixed inconsistent generation issue between `metadata.generation` and `status.observedGeneration`.

[jwcesign]

/cc @XiShanYongYe-Chang @chaosi-zju @chaunceyjiang

[codecov-commenter]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (f56af66) 53.46% compared to head (e50f414) 53.39%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4138      +/-   ##
==========================================
- Coverage   53.46%   53.39%   -0.08%     
==========================================
  Files         234      234              
  Lines       23279    23307      +28     
==========================================
- Hits        12447    12445       -2     
- Misses      10150    10180      +30     
  Partials      682      682              

Flag	Coverage Δ
unittests	53.39% <0.00%> (-0.08%)	⬇️

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

Files	Coverage Δ
pkg/controllers/status/crb_status_controller.go	47.54% <0.00%> (-0.80%)	⬇️
pkg/controllers/status/rb_status_controller.go	46.03% <0.00%> (-0.75%)	⬇️
pkg/controllers/status/common.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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