Automatic merge from submit-queue (batch tested with PRs 49871, 49422, 49092, 49858, 48999)

ScaleIO Volume Plugin - Volume attribute fixes and updates

**What this PR does / why we need it**:
This is a housekeeping PR for small enhancements and fixes to the ScaleIO volume plugin to address issues:
- Enforcement of fsGroup
- Enable ScaleIO multiple-instance volume mapping
- Tighter validation of PVC parameters
- Injection of default PVC capacity when omitted
- Better alignment of PVC, PV, and volume names for dynamic provisioning

**Special notes for your reviewer**:

**Release note**:

```release-note
Enforcement of fsGroup; enable ScaleIO multiple-instance volume mapping; default PVC capacity; alignment of PVC, PV, and volume names for dynamic provisioning
```