Proposing API to support migration rollback

[RainbowMango]

What type of PR is this?

/kind api-change

What this PR does / why we need it:

This PR proposes the API change to address the requirement of #5101.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

API Change: Introduced `PreserveResourcesOnDeletion` field to both PropagationPolicy and ClusterPropagationPolicy API, which provides the ability to roll back migration safely. 

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.93%. Comparing base (b8edec1) to head (aa61791).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5575   +/-   ##
=======================================
  Coverage   33.93%   33.93%           
=======================================
  Files         645      645           
  Lines       44857    44857           
=======================================
+ Hits        15220    15221    +1     
+ Misses      28479    28478    -1     
  Partials     1158     1158           

Flag	Coverage Δ
unittests	33.93% <ø> (+<0.01%)	⬆️

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[a7i]

/lgtm ✨

[RainbowMango]

Thanks @a7i.
I talked to @CharlesQQ as well, he will be the first user using this feature.
Let's move this forward.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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