Issue #3479689 by roderik: Fuller test coverage for D11 (also 8.x-2.x)

.gitlab-ci.yml

composer.json

modules/custom_elements_thunder/README.md

modules/custom_elements_ui/js/custom_elements_ui.js

tests/modules/custom_elements_test_paragraphs/README.md

.../install/field.field.media.gallery.field_media_images.yml

...config/install/field.field.media.twitter.field_author.yml

...onfig/install/field.field.media.twitter.field_content.yml

...hs/config/install/field.field.media.twitter.field_url.yml

...fig/install/field.field.paragraph.gallery.field_media.yml

...fig/install/field.field.paragraph.twitter.field_media.yml

...raphs/config/install/field.storage.media.field_author.yml

...aphs/config/install/field.storage.media.field_content.yml

...config/install/field.storage.media.field_media_images.yml

...ragraphs/config/install/field.storage.media.field_url.yml

...hs/config/install/field.storage.paragraph.field_media.yml

...nts_test_paragraphs/config/install/media.type.gallery.yml

...nts_test_paragraphs/config/install/media.type.twitter.yml

...phs/config/install/paragraphs.paragraphs_type.gallery.yml

...phs/config/install/paragraphs.paragraphs_type.twitter.yml