Automatic merge from submit-queue (batch tested with PRs 49865, 53731, 54013, 54513, 51502). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Added unit test cases for the public methods of pkg/util/taints.go
Added unit test cases for the public methods of pkg/util/taints.go
Fixed#49384, related to #49699
**Release note**:
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