Adds revert template for security MRs
What does this MR do and why?
On the previous security release, two security fixes had to be reverted because they impacted GitLab.com availability or introduced bug to the codebase. Links:
- https://gitlab.com/gitlab-org/gitlab/-/issues/393774#note_1331187212
- https://gitlab.com/gitlab-com/gl-infra/production/-/issues/8606#note_1335427849
The approach for each of them depended on some variables. This MR template aims to describe the different options to be chosen based on those variables, and expects to serve as guidance to stage teams when they need to revert a security merge request.
Related to gitlab-com/gl-infra/delivery#19685 (closed)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
- [-] I have evaluated the MR acceptance checklist for this MR.
Edited by Mayra Cabrera