Mayra Cabrera authored Dec 10, 2020 and Simon Knox committed Dec 10, 2020

A new setting was added under Project > Visibility to allow commit
authors to edit comimt messages on unprotected branches. This setting is
stored in a new column in 'project_settings' table.

Changes are currently under a feature flag.

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/287798