Merge branch '3460650-jsnippet-needs-some' into '8.x-1.x'

config/schema/jsnippet.schema.yml

...ig/install/core.entity_view_display.node.page.default.yml

...t/config/install/field.field.node.page.field_jsnippet.yml

...test/config/install/field.storage.node.field_jsnippet.yml

...ippet_test/config/install/jsnippet.jsnippet.add_class.yml

...s/modules/jsnippet_test/config/install/node.type.page.yml

tests/modules/jsnippet_test/jsnippet_test.info.yml

tests/src/Functional/JSnippetAdminTest.php

tests/src/FunctionalJavascript/JSnippetTest.php