Integrate gitlab-ci/define-yamllint-explicitly

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@2b2bc220

Define yamllint job explicitly in each pipeline

The yamllint job was included in the pipeline implicitly via the
inclusion of common.yml. This is not very transparent. Make the common
definition a base job and extend it explicitly in each pipeline now.

Add infrastructure stage comment header into both yaml files.

.gitlab-ci @ 2b2bc220

-Subproject commit 686323c648881a4fa0f3f8ae6e305d17337eecf3
+Subproject commit 2b2bc22010347ad46361e2d781a3d8ff745a1710

.gitlab-ci.yml

@@ -4,7 +4,7 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: 686323c648881a4fa0f3f8ae6e305d17337eecf3
+    ref: 2b2bc22010347ad46361e2d781a3d8ff745a1710
     file: 'manifest-integration-yocto.yml'
 
 variables: