Add Release Checklist template

Adds a Release Checklist issue template, which will be used to plan releases.

Closes #2252 (closed)

@bikebilly @ayufan Any comments?

unmarked as a Work In Progress

@nolith Since you'll be responsible for releasing %10.1, please take a look on this and ask any questions if something is not clear :)

Thank you @tmaczukin The runbook parts look quite cryptic to me, maybe I can be in screen sharing with you when you'll deploy %10.0

approved this merge request

merged

added Documentation and removed ~60197 labels