Automatic merge from submit-queue (batch tested with PRs 40544, 44338, 45225)
Use ObjectGetter Interface instead of clientset.Interface for leaderelection pkg
**What this PR does / why we need it**:
We plan to reuse leaderelection pkg to add leader election function to federation controller manager, but the current implementation uses kubernetes clientset.Interface and federation clientset does not satisfy all the interface methods. It would be better if the leaderelection package use rest.Interface which is also supported by federation clientset.
This pr is to refactor leaderelection pkg to use rest.Interface instead of clientset.Interface
**Special notes for your reviewer**:
This is a sub-task of bigger work to add leader election to federation controller manager as documented in #44283
**Release note**:
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