[feature]: Update Redis to use x.509 certs for authentication

[fullykubed]

The username + password auth in redis has a few downsides:

• Password rotation is very tricky b/c only one password can be "active" at any given time. When coupled with the fact that each node manages its own auth independently, this can cause issues during password rotations.
• Since each node manages its own auth independently, integration with Vault is very tricky.
• Usernames and passwords are fairly difficult to debug. Unlike certs, they do not care metadata about issue and expiration time.

As a result, we are changing the standard auth paradigm to use x.509 certificates.