Add the ability to delete the old postgres pvc automatically if desired

[rooftopcellist]

• this parameter will be hidden on the UI and should only be used for test runs etc. Users should be intention about deleting the old PVC, which is why by default, this will not delete the old PVC from the previous PostgreSQL version

SUMMARY

This adds back the functionality we had before, but with the correct boolean value...

ISSUE TYPE

• Bug, Docs Fix or other nominal change