feat(kcc): support kcc canary update

[gary-lgy]

What type of PR is this?

Features

What this PR does / why we need it:

Support canary update for KCC targets.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 67.51592% with 153 lines in your changes missing coverage. Please review.

Project coverage is 56.30%. Comparing base (bcf012a) to head (584d3d0).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/kcc/kcct.go	66.12%	115 Missing and 31 partials ⚠️
pkg/controller/kcc/util/kcct.go	85.18%	3 Missing and 1 partial ⚠️
pkg/controller/kcc/kcc.go	0.00%	1 Missing ⚠️
pkg/controller/kcc/target/target_handler.go	0.00%	1 Missing ⚠️
pkg/metaserver/kcc/manager.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #722      +/-   ##
==========================================
+ Coverage   56.26%   56.30%   +0.04%     
==========================================
  Files         598      597       -1     
  Lines       68033    68022      -11     
==========================================
+ Hits        38277    38302      +25     
+ Misses      25692    25668      -24     
+ Partials     4064     4052      -12     

Flag	Coverage Δ
unittest	56.30% <67.51%> (+0.04%)	⬆️

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