Integrate gitlab-ci/fix-gitlab-ci-integration and 6 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@6f09c66c

CI: deploy-gitlab-ci: Don't stop integration when one project is already updated

Prior to this change the integration stop when one of the
projects had already the latest ref of gitlab-ci in to submodule.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@6c39166f

CI: deploy-gitlab-ci: Don't stop integration when one project is already updated

Prior to this change the integration stop when one of the projects had
already the latest ref of gitlab-ci in to submodule.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@aaac8d1c

changelog_generator: Use logging instead of print, fix black

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@79afb233

CI: Move changelog_generator to gitlab-ci project

The script can also be run in the normal python container, so this
slightly reduces the complexity.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@383a5aca

Added qt-multi-screen-compositor to project list

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@3e88ad8e

buildfng: Moved the image and distro variables to global

The image and distro for the buildfng job can now be set via
global/external variables.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@751fc360

Improve CI documentation

BCS 746-000636