[Meta] Update automation to work for multiple MR's associated with issue (#452219) · Issues · GitLab.org / GitLab · GitLab

[Meta] Update automation to work for multiple MR's associated with issue

## Description From https://gitlab.com/gitlab-com/content-sites/handbook/-/merge_requests/4495#note_1829518679, let's update our RD Workflow automation to work for both a single and list of `MR:` in an issue.

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