ci: use common workflow that auto-cancel earlier MR pipelines

.gitlab/ci/common.yml

@@ -314,10 +314,3 @@ default:
     - fetch_submodules
     - export EXTRA_CFLAGS=${PEDANTIC_CFLAGS}
     - export EXTRA_CXXFLAGS=${PEDANTIC_CXXFLAGS}
-  retry:
-    max: 2
-    when:
-      # In case of a runner failure we could hop to another one, or a network error could go away.
-      - runner_system_failure
-      # Job execution timeout may be caused by a network issue.
-      - job_execution_timeout

.gitlab/ci/docs.yml

@@ -16,9 +16,6 @@
 .patterns-example-readme: &patterns-example-readme
   - "examples/**/*.md"
 
-.patterns-docs-preview: &patterns-docs-preview
-  - "docs/**/*"
-
 .if-protected-check: &if-protected-check
   if: '($CI_COMMIT_REF_NAME == "master" || $CI_COMMIT_BRANCH =~ /^release\/v/ || $CI_COMMIT_TAG =~ /^v\d+\.\d+(\.\d+)?($|-)/)'