Automatic merge from submit-queue (batch tested with PRs 46926, 48468)
Added helper funcs to schedulercache.Resource.
**What this PR does / why we need it**:
Avoid duplicated code slice by helper funcs.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#46924
**Release note**:
```release-note-none
```
- Prevents kubelet from overwriting capacity during sync.
- Handles opaque integer resources in the scheduler.
- Adds scheduler predicate tests for opaque resources.
- Validates opaque int resources:
- Ensures supplied opaque int quantities in node capacity,
node allocatable, pod request and pod limit are integers.
- Adds tests for new validation logic (node update and pod spec).
- Added e2e tests for opaque integer resources.
