Move "disallow merging to maintained branches" closer to tagging

Michal Nowak requested to merge mnowak/update-release-checklist into main

Updating GitLab settings for all maintained branches to disallow merging to them has an unfortunate consequence: daily scheduled pipelines won't be executed anymore. This is a problem because we need the pipelines to ensure no new bugs were introduced just before a code freeze.

The "Announce (on Mattermost) that the code freeze is in effect" item is still in place but is now more of a social "disallow merging to maintained branches".

Trigered by MM discussion.

Edited by Michal Nowak

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