Integrate gitlab-ci/switch-to-mr-pipelines and 3 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@d67898a2

Manifest: skip build if "skip build" label is set

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@bffc6097

Manifest: switch from branch pipelines to merge request pipelines

This will make the manifest project support the "skip build" label.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@5ba1ac68

Revert "Skip build if "skip build" label is set"

This reverts commit 4db257d36052c74eabed7ef43a05d98d3998ffec.

It does not work on the manifest, because we do not run merge request
pipelines there, so CI_MERGE_REQUEST_LABELS is not set at all.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@4db257d3

Skip build if "skip build" label is set

.gitlab-ci @ d67898a2

-Subproject commit 9d430fe85bd049af05210b103a55e69171c5994b
+Subproject commit d67898a2a092096eecddcfa4d42cd740c6959be1

.gitlab-ci.yml

@@ -4,11 +4,11 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: 9d430fe85bd049af05210b103a55e69171c5994b
+    ref: d67898a2a092096eecddcfa4d42cd740c6959be1
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: 9d430fe85bd049af05210b103a55e69171c5994b
+  GITLAB_CI_REVISION: d67898a2a092096eecddcfa4d42cd740c6959be1
   # FIXME: This is only necessary due to the following GitLab limitation:
   # https://gitlab.com/gitlab-org/gitlab/-/issues/209904
   # As soon as this gets fixed upstream, the hard-coded branch name should be removed.