Automatic merge from submit-queue.

[1.10] Automated cherry pick of #64351: Only mount subpath as readonly if specified in volumeMount

Automated cherry pick of #64351: Only mount subpath as readonly if specified in volumeMount

**Release note**:

```release-note
Fixes issue for readOnly subpath mounts for SELinux systems and when the volume mountPath already existed in the container image.
```