Metadig-worker and Metadig-scheduler Helm chart `pv.yaml` name/namespace update

[doulikecookiedough]

In the pv.yaml files found below, there appears to be a mismatch in credentials.

helm/metadig-scheduler/pv.yaml
helm/metadig-worker/pv.yaml

Per @artntek's PR feedback:

the credentials in this csi-cephfs-secret don't appear to match those in the security repo (security/k8s/cephfs-subvols.gpg). Instead, it's listed as:

subvolume: k8sdevsubvol
user: (redacted)
group: k8sdevsubvolgroup
path: /volumes/k8sdevsubvolgroup/k8sdevsubvol/4b7cd044-4055-49c5-97b4-d1240d276856/
key: (matches this one) 

(note the different path, too)

The credentials for:

## PRODUCTION
rootPath: /volumes/pdg-subvol-group/pdg-subvol/a5c90f20-f824-4ce9-b175-6685d7846520/repos
## DEV/TEST
rootPath: /volumes/tdg-subvol-group/tdg-subvol/a5c90f20-f824-4ce9-b175-6685d7846520/repos

...are already installed in secrets named:

• csi-cephfs-prod-data-pdg-subvol (for prod), and
• csi-cephfs-test-data-tdg-subvol (for dev)

For consistency and to reduce confusion, it would be good to replace name: csi-cephfs-secret with name: csi-cephfs-prod-data-pdg-subvol (and ideally to delete csi-cephfs-secret (if nothing else is using it).

Review, apply and test these changes.

• Note, access to dev k8s is required so that the updated name/namespace can be applied. This cannot be done via dev-metadig k8s directly.