Console: VMDisk upload panel does not show the disk's capacity #3958

Follow-up from review on #3847.

The upload panel gives the virtctl image-upload command but never shows how large the disk actually is, so there is nothing on the page telling the user the ceiling their image has to fit under. packages/apps/vm-disk/values.yaml defaults storage to 5Gi and templates/dv.yaml renders it into spec.storage.resources.requests.storage, so the number is available on the DataVolume the panel already fetches. The DataVolumeSpec type in vm-disk-upload.ts models only source, so it would need widening.

Worth noting the upload proxy ingress sets ssl-passthrough: "true", so no proxy-body-size limit applies and the disk capacity is the only real ceiling.

Raised by IvanHunters in review.