fix: Creating secret when secretName is provided

[dacbd]

Prevents us from trying to create a redis secret of the same name as the users provided secret.

Other changes:

• template reference wandb.redis.passwordSecret changed to wandb.redis.secretName better reflects what the value is.
• moves REDIS_CA_CERT to the configmap

ON HOLD until after the holidays, need to cc @flamarion for validation.