Since we updated default routing rules in Rails gitlab-org/gitlab!97908 (merged), now we need to update the default queues listened by Sidekiq. This MR updates SIDEKIQ_QUEUES based on the following condition:
Defaults to 'default,mailers' unless global.appConfig.sidekiq.routingRules is set.
Generate SIDEKIQ_QUEUES based on the queues listed in routingRules if set.
User can still customize SIDEKIQ_QUEUES in the Sidekiq chart per pods values (Existing condition)
Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.
