[Cadence] Setup Job doesn't pull value from secret

[johnkost]

Describe the bug
When using an existing secret in cadence chart for the mysql credentials, the job doesn't use them so you are forced to pass in both a secret and the password.

Steps to reproduce the issue:
Deploy chart using existing secret and no password field.

Expected behavior
The chart successfully installs when only passing in the existing secret field.

Screenshots

Additional context