Updates the readiness template
Part of https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15459, this refactors our readiness review process so that it follows a checklist driven issue and expands readiness to all significant changes that will be made on gitlab.com.
This also removes the service_readiness
template, instead we will use a single template for all changes.
Dependencies
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Handbook MR gitlab-com/www-gitlab-com!100910 (merged)
Edited by John Jarvis