Use a ConnectionPool for Rails.cache on Sidekiq servers

Paco Guzman requested to merge 22364-rails-cache-redis-connection-pool into master

What does this MR do?

On Sidekiq server we'll use a connection pool to connect to the redis store used for Rails cache

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #22364 (closed)

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