Add Root Cause Analysis template for unplanned upgrade stops
What does this MR do and why?
Adding Root Cause Analysis template for unplanned upgrade stops based on https://handbook.gitlab.com/handbook/engineering/root-cause-analysis/. Documentation for the process is being added with Add Unplanned Upgrade Stop Workflow page (gitlab-com/content-sites/handbook!5158 - merged) to handbook
The new template is needed to perform analysis for unplanned upgrades as each unplanned upgrade stop is very disruptive for customers.
Related to Introduce Root Cause Analysis process for unpla... (#444327 - closed) and Add Unplanned Upgrade Stop Workflow page (gitlab-com/content-sites/handbook!5158 - merged)
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.