Consolidate contrib module setup

@jonathanshaw I need "Maintainer" permission at https://git.drupalcode.org/project/gift_aid/-/project_members to be able to configure the settings such as default branch - or if you prefer you could do that part directly yourself.

The MR system doesn't seem to be working yet, so I just pushed the .gitlab file to 1.x directly.

It is now running a pipeline at https://git.drupalcode.org/project/gift_aid/-/pipelines so that seems like a step forward.

Reassigning for #2 please.

#2 done

Thanks, done.

Automatically closed - issue fixed for 2 weeks with no activity.