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Use consts as predicate key names in handlers

**What this PR does / why we need it**:

Per discussion in: https://github.com/kubernetes/kubernetes/pull/59335/files#r168351460

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59951

**Special notes for your reviewer**:

**Release note**:

```release-note
Use consts as predicate name in handlers
```