Remove PVC from bootable volume since it's not supported now (see https://issues.redhat.com/browse/CNV-41599)
1. need to improve the example in bootable volume page, currently, no bootable volume presents in the list while creating it from the default yaml, need to adjust the YAML to get it presenting in the list.
2. remove PVC from the filter on the Bootable volume page and catalog page
3.  In catalog page, remove PVC from the tooltip of "Select volume to boot from".

1.
2.
3.