publish release note for v1.12.0

[zhzhuang-zju]

What type of PR is this?
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.47%. Comparing base (1b8d09c) to head (49e0969).
Report is 14 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5896      +/-   ##
==========================================
+ Coverage   46.30%   46.47%   +0.17%     
==========================================
  Files         663      663              
  Lines       54753    54740      -13     
==========================================
+ Hits        25351    25441      +90     
+ Misses      27774    27671     -103     
  Partials     1628     1628              

Flag	Coverage Δ
unittests	46.47% <ø> (+0.17%)	⬆️

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[RainbowMango]

/assign

[RainbowMango]

Good job, only some nits!

[zhzhuang-zju]

Once pr passes code review, I'll merge the commit

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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