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Increase scheduler cache generation number monotonically in order to avoid collision
**What this PR does / why we need it**:
Increments the scheduler cache generation number monotonically to avoid collision of the generation numbers. More context in #63262.
**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#63262.
**Special notes for your reviewer**:
**Release note**:
```release-note
Increase scheduler cache generation number monotonically in order to avoid collision and use of stale information in scheduler.
```
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