fix crr is stuck when multi crrs specify same pod together

[chengjoey]

Ⅰ. Describe what this PR does

fix crr is stuck when multi crrs specify same pod together #1626

when multi crrs specify same pod at the same time, only one will be enqueue

kruise/pkg/daemon/containerrecreate/crr_daemon_controller.go

Lines 160 to 162 in 8ae13b1

	func objectKey(obj *appsv1alpha1.ContainerRecreateRequest) string {
	return obj.Namespace + "/" + obj.Spec.PodName
	}

The original logic may be designed this way intentionally, but would it be better to use ${namespace}/${crdName} as the key?

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

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[chengjoey]

Also, is it possible to modify the webhook to directly reject requests when there is a running crr processing the same pod?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.46%. Comparing base (0d0031a) to head (dc0fcdf).
Report is 50 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1653      +/-   ##
==========================================
+ Coverage   47.91%   49.46%   +1.54%     
==========================================
  Files         162      183      +21     
  Lines       23491    18997    -4494     
==========================================
- Hits        11256     9396    -1860     
+ Misses      11014     8378    -2636     
- Partials     1221     1223       +2     

Flag	Coverage Δ
unittests	49.46% <ø> (+1.54%)	⬆️

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[zmberg]

Also, is it possible to modify the webhook to directly reject requests when there is a running crr processing the same pod?

@chengjoey agree.