Issue #2404021 by yched, amateescu: entity_reference formatters should be in Core

core/config/schema/core.entity.schema.yml

...n/Field/FieldFormatter/EntityReferenceEntityFormatter.php

...gin/Field/FieldFormatter/EntityReferenceFormatterBase.php

...lugin/Field/FieldFormatter/EntityReferenceIdFormatter.php

...in/Field/FieldFormatter/EntityReferenceLabelFormatter.php

...ntity_reference/config/schema/entity_reference.schema.yml

...ules/entity_reference/src/RecursiveRenderingException.php

...rc/Tests/EntityReference/EntityReferenceFormatterTest.php

...eld/src/Tests/EntityReference/EntityReferenceItemTest.php

...ieldFormatter/EntityReferenceTaxonomyTermRssFormatter.php