Remove Gitlab::Sessions::RedisStore as session store
What does this MR do and why?
Remove Gitlab::Sessions::RedisStore as session store
In !176108 (merged), we
added a new implementation of Redis session store
Gitlab::Sessions::CacheStore which is based on
ActionDispatch::Session::CacheStore in order to support migration to
Redis Cluster for .com. The whole migration plan can be found in
gitlab-com/gl-infra/data-access/durability/team#35.
This removes the old Gitlab::Sessions::RedisStore as the redis session
store.
Self-managed instances wouldn't be affected since we have
Gitlab::Sessions::CacheStoreCoder to ensure compatibility within the
two stores. More context at gitlab-com/gl-infra/data-access/durability/team#35 (comment 2283399167)
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