Skip the message suggesting a type:: label on merge requests targeting stable branches

Whenever a merge request is submitted in the GitLab project, a message is posted on the merge request requesting the author to add a type label (e.g typebug, typefeature), example:

As part of the maintenance policy extension, tooling was implemented into the GitLab project to guide engineers to safely merge bug fixes into stable branches, this includes a Danger check specifically asking for the typebug label, if this label is not present and the merge request introduces application changes, Danger will fail.

The Danger check duplicates the message posted by GitLab-bot, to avoid confusion lets skip the message from GitLab-bot on merge requests targeting stable branches.