Upgrade redis gem to v5

What does this MR do and why?

This MR upgrades redis gem from v4.8.0 to v5.0.8. This MR is a tidied-up version of !134862 (closed) where the commits are re-organized for clarity.

See issue gitlab-com/gl-infra/scalability#2727 (closed)

Main changes are

• redis-cluster-store patch in lib/gitlab/patch/redis_store_factory.rb and lib/gitlab/redis/cluster_store.rb
• removal of cross-slot pipeline codes in lib/gitlab/redis/cross_slot.rb since redis gem v5 handles pipelining to multiple shards
• fixing typing for inputs into the new redis gem client. included lib/gitlab/redis/command_builder.rb
• actioncable initialisation to be compatible with redis-client in config/initializers/action_cable.rb

MR acceptance checklist

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Before	After

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Review summary

• backend reviewer approval from @dfrazao-gitlab
• database reviewer approval from @dgruzd
• groupauthentication approval from @dblessing (already approved but it got revoked by new pushes)
• Redis subject matter expert approval from @marcogreg
• clickhouse - to be done by @ahegyi
• devopsverify - to be done by @drew
• database maintainer - @ahegyi
• backend maintainer - @drew
• Quality - @at.ramya