Upgrade redis gem v5 - 2nd attempt

What does this MR do and why?

This MR reverts the revert MR for !144224 (merged).

Following investigations in gitlab-com/gl-infra/scalability#2826 (closed), we have narrowed the root cause to the peek redis views which patches Redis::Client. The fix for this was merged separately in !144388 (merged).

There is an upstreamed fix in https://github.com/redis-rb/redis-client/pull/173 to prevent the command prelude from being mutated by its callers.

In this MR we also:

• perform a minor clean up to reduce scope of the MR since lib/gitlab/redis/command_builder.rb handles NilTypes for us
• omit the custom command builder from Sidekiq to avoid any

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Before	After

How to set up and validate locally

1. Set up a local redis with password required and a short timeout of 5s

redis-server --port 6370 --requirepass foobar --timeout 5

2. Update config.yml to use the

➜  gitlab git:(sc1-migrate-repository-cache) cat config/redis.yml
---
development:
  shared_state:
    url: 'redis://:foobar@localhost:6370'

3. Start up gdk and open the web UI. Refresh after >5s. You should not see any errors.

4. Use this commit 13e55430 and repeat step 3. Run gdk restart rails to see Redis::CannotConnectError at /flightjs/Flight WRONGPASS invalid username-password pair or user is disabled.