Delete Account needs to check for running pods before deleting PVC

[bodom0015]

Our current Delete Account apparently does not wait for pods to shut down, which creates a race condition. The PVC is deleted immediately, and this causes any pods that are still running to fail to shutdown because the PVC fails to unmount.

We should check for running pods before deleting an account, and have a few options for handling this case:

1. any running pods could be shut down, with the PVC to be deleted afterward
2. we could trigger an error that prevents the account from being deleted

[bodom0015]

This could probably just trigger a DELETE on the namespace. This way, Kubernetes handles all of the shutdown procedures in the background and should do everything in the right order to ensure the namespace is cleaned up completely