make gitlab super repository the single source of truth

The qds/dev branch in qt-creator/tqtc-qtc-super · Gerrit Code Review (qt-project.org) repository is the starting point for developers.

Our CI uses its own super repository -> Design Studio / Qt Design Studio · GitLab

As a developer, it would be nice to have the information that sha1s are the ones that the CI tested.

The idea is to get the GitLab "super" repository in a structure that is nice to everyone and sync it to Gerrit every night with the latest successful sha1s

Structure proposal:

├───gitlab
│   └───pipelines
│       ├───common
│       └───stages
│           ├───build
│           ├───docker
│           ├───prepare
│           ├───release
│           └───test
│               └───unit
├───docs
├───qtcreator
├───quickdesigner
├───qtquickdesigner-components
└───telemetry

Bold written directory names are sub repositories

Note to my self: license checker is not necessary