Merge branch '2951046-allow-parsing-php' into '11.x'

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

core/core.services.yml

core/lib/Drupal/Component/Serialization/Yaml.php

core/lib/Drupal/Core/Config/AutoloadingStorage.php

core/lib/Drupal/Core/Config/ConfigInstaller.php

core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php

core/lib/Drupal/Core/Config/SyncFactory.php

core/lib/Drupal/Core/TypedData/Plugin/DataType/Enum.php

...ig_enum_test/config/install/config_enum_test.settings.yml

...onfig_enum_test/config/schema/config_enum_test.schema.yml

...s/config/tests/config_enum_test/config_enum_test.info.yml

core/modules/config/tests/config_enum_test/src/EnumValue.php

...odules/config/tests/src/Functional/ConfigImportUITest.php

...ules/config/tests/src/Functional/ConfigInstallWebTest.php

...standard/config/install/field.storage.node.field_tags.yml

.../Drupal/Tests/Component/Serialization/BackedEnumValue.php

.../tests/Drupal/Tests/Component/Serialization/EnumValue.php

core/tests/Drupal/Tests/Component/Serialization/YamlTest.php