Increases LB SD refresh thread interruption delta time

What does this MR do and why?

MR that introduced the logging: !121643 (merged) - it has the backstory and reasoning for the new log as well.

On monitoring the logs, there were ~5500 occurrences of service_discovery_refresh_thread_interrupt event with below backtrace.

/srv/gitlab/lib/gitlab/database/load_balancing/host.rb:85:in sleep'
/srv/gitlab/lib/gitlab/database/load_balancing/host.rb:85:in disconnect!'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:155:in block in replace_hosts'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:154:in each'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:154:in replace_hosts'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:132:in refresh_if_necessary'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:95:in block in perform_service_discovery'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:94:in times'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:94:in perform_service_discovery'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:83:in block (2 levels) in start'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:80:in loop'
/srv/gitlab/lib/gitlab/database/load_balancing/service_discovery.rb:80:in block in start'

In https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/database/load_balancing/host.rb#L82, the condition can allow sleep of max 4s. i.e: 2 loops, with 120 seconds as the timeout.

So increasing the existing DISCOVERY_THREAD_REFRESH_DELTA to 5 (>4s)

Screenshots or screen recordings

Source: Kibana logs

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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