Standardize node volume claim naming

[brucetony]

The prefixes for PVCs are inconsistent and should be standardized:

NAME                                                      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS        VOLUMEATTRIBUTESCLASS   AGE
data-node-datastore-blaze-0                               Bound    pvc-293b0572-79ba-448a-a750-7a02eab3bff1   5Gi        RWO            microk8s-hostpath   <unset>                 57s
flame-node-minio                                          Bound    pvc-32989c5b-c26e-4a63-acc9-6ad3ba29f3ba   10Gi       RWO            microk8s-hostpath   <unset>                 58s
mongodb-volume-flame-node-mongodb-0                       Bound    pvc-99eac6ee-29bd-4a82-860c-f001e805f069   500Mi      RWO            longhorn-r1         <unset>                 57s
node-datastore-minio                                      Bound    pvc-b264e5bd-4af8-4add-bd3e-5ad3a4940769   5Gi        RWO            longhorn-r1         <unset>                 58s
postgres-data-flame-node-postgresql-0                     Bound    pvc-babafeda-4151-4b7e-a148-84eb3561c251   8Gi        RWO            longhorn-r1         <unset>                 57s
postgres-data-keycloak-flame-node-keycloak-postgresql-0   Bound    pvc-aa1de7bc-da13-422b-8f8c-11786bdfe22f   8Gi        RWO            longhorn-r1         <unset>                 56s
postgres-data-kong-flame-node-kong-postgresql-0           Bound    pvc-95715665-abd7-4450-9d8f-4baf21a914da   2Gi        RWO            longhorn-r1         <unset>                 57s

[brucetony]

Naming conventions for k8s recommend the following:

• Consistency
• Clarity/Readability
• Brevity
• Use lowercase & hyphens (-)

There the prefixes will be removed as they are redundant, but left as an option for the user. Preferably, descriptors are added as suffixes, but this is not an obvious option for the node sub-charts so it will not be applied here.

The data store name overrides will be left as they are since they are an optional addition and their charts rely on the fixed names.

[brucetony]

Discovered why this originally became an issue, the new sub-charts from groundhog2k require a volumeName, i.e. a prefix, in order to deploy a PVC for a StatefulSet: https://github.com/groundhog2k/helm-charts/blob/9f4de20fa88752922ae89b3f8a81ffe43b8c23cd/charts/postgres/templates/statefulset.yaml#L333.