[SE-5512] refactor: drop redis setup and use tutor for redis

Description

This PR drops custom Redis support from Grove. After merging this PR, Grove will only support the Tutor managed Redis instances pods.

Testing instructions

-1. read the code 0. check out the given commit in the grove submodule

1. run ./tf plan against the DO staging env
2. ensure the output is reasonable
3. ensure no related changes would be applied (as it is already applied)
4. run ./kubectl get pods and ensure no pods are running in the default namespace
5. run ./kubectl get namespaces and ensure no redis-relates namespaces are defined

Author notes

Although we drop redis support for now, it does not mean that we may not add it later on in another way, especially if it turns out that keeping a pod per instance is pricy.