Merge 11.x HEAD.

.gitlab-ci.yml

.gitlab-ci/pipeline-test-only.yml

.gitlab-ci/pipeline.yml

.gitlab-ci/scripts/server-setup.sh

.gitlab-ci/scripts/test-only.sh

composer.json

composer.lock

composer/Metapackage/CoreRecommended/composer.json

composer/Metapackage/PinnedDevDependencies/composer.json

core/.gitignore

core/MAINTAINERS.txt

core/composer.json

core/config/schema/core.data_types.schema.yml

core/includes/install.inc

core/lib/Drupal/Component/Annotation/Doctrine/DocParser.php

.../Component/Annotation/Doctrine/SimpleAnnotationReader.php

core/lib/Drupal/Component/Datetime/DateTimePlus.php

core/lib/Drupal/Component/DependencyInjection/composer.json

core/lib/Drupal/Component/EventDispatcher/composer.json

core/lib/Drupal/Component/Gettext/PoHeader.php