Reduce # of PVCs used in Dev

**Describe the task**
We spin up PVCs for nats, statefulsets, tileserv backups, wal logs, etc.
Platform Services has a limit set to 60 PVCs per namespace, which we hit easily when we have multiple dev deployments.

We can limit the # of PVCs in dev by sharing PVCs and namespacing them based on subpaths

See linked SO thread in additional context.

**Acceptance Criteria**
- [ ] PVCs per dev deployment are minimized

**Additional context**
Solution options:
- Ephemeral storage: https://stackoverflow.developer.gov.bc.ca/a/996/16
- Sharing PVC sub paths: https://stackoverflow.developer.gov.bc.ca/questions/973

The issue names no files, tests, or entry points. Review the linked Stack Overflow discussions and inventory PVCs for NATS, StatefulSets, tile-server backups, and WAL logs across dev deployments; done means dev deployments use fewer PVCs and remain functional under the namespace limit.

Written by the indexing model from the issue text.