Cortex Redis flags with multiple dots

[CharlieTLe]

Describe the bug
There are some flags in Cortex that are invalid. They have multiple dots in the flag name instead of just one.

To Reproduce
Steps to reproduce the behavior:

1. Print the cortex configuration flags.

./cmd/cortex/cortex-arm64 -help | grep \\.\\.
  -blocks-storage.bucket-store.chunks-cache.redis..tls-ca-path string
  -blocks-storage.bucket-store.chunks-cache.redis..tls-cert-path string
  -blocks-storage.bucket-store.chunks-cache.redis..tls-insecure-skip-verify
  -blocks-storage.bucket-store.chunks-cache.redis..tls-key-path string
  -blocks-storage.bucket-store.chunks-cache.redis..tls-server-name string
  -blocks-storage.bucket-store.index-cache.redis..tls-ca-path string
  -blocks-storage.bucket-store.index-cache.redis..tls-cert-path string
  -blocks-storage.bucket-store.index-cache.redis..tls-insecure-skip-verify
  -blocks-storage.bucket-store.index-cache.redis..tls-key-path string
  -blocks-storage.bucket-store.index-cache.redis..tls-server-name string
  -blocks-storage.bucket-store.metadata-cache.redis..tls-ca-path string
  -blocks-storage.bucket-store.metadata-cache.redis..tls-cert-path string
  -blocks-storage.bucket-store.metadata-cache.redis..tls-insecure-skip-verify
  -blocks-storage.bucket-store.metadata-cache.redis..tls-key-path string
  -blocks-storage.bucket-store.metadata-cache.redis..tls-server-name string

Expected behavior

  -blocks-storage.bucket-store.chunks-cache.redis.tls-ca-path string
  -blocks-storage.bucket-store.chunks-cache.redis.tls-cert-path string
  -blocks-storage.bucket-store.chunks-cache.redis.tls-insecure-skip-verify
  -blocks-storage.bucket-store.chunks-cache.redis.tls-key-path string
  -blocks-storage.bucket-store.chunks-cache.redis.tls-server-name string
  -blocks-storage.bucket-store.index-cache.redis.tls-ca-path string
  -blocks-storage.bucket-store.index-cache.redis.tls-cert-path string
  -blocks-storage.bucket-store.index-cache.redis.tls-insecure-skip-verify
  -blocks-storage.bucket-store.index-cache.redis.tls-key-path string
  -blocks-storage.bucket-store.index-cache.redis.tls-server-name string
  -blocks-storage.bucket-store.metadata-cache.redis.tls-ca-path string
  -blocks-storage.bucket-store.metadata-cache.redis.tls-cert-path string
  -blocks-storage.bucket-store.metadata-cache.redis.tls-insecure-skip-verify
  -blocks-storage.bucket-store.metadata-cache.redis.tls-key-path string
  -blocks-storage.bucket-store.metadata-cache.redis.tls-server-name string