Updated granting-rails-or-db-access runbook and made it much more self-explanatory and provided more explanations so anyone following the runbook has enough info to follow it and complete the task

Revert "Re-added production filter since staging is still triggering production alerts in pagerduty"

This reverts commit 2fd74d39.

`type = "postgres"`: normal postgres box, part of HA
`type = "postgres-archive"`: archive replica
`type = "postgres-delayed"`: delayed replica

TODO: Once postgres-01-db-gprd is back to its normal role, clean up
alert filters

alert when we see too many sidekiq exceptions for a controller. Addresses gitlab-com/infrastructure#4651