No Gitlab Redis Secret Clobber

General MR

Summary

Changes the secret name used, so we don't have an error trying to write over and existing gitlab/redis secret.

Instead, when a user sets a password, a new secret is created, and gitlab will switch over to using the new secret name.

Closes https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab/-/issues/126