Issue #3090476 by e0ipso: Fix tests for 2.x

composer.json

openapi_jsonapi.info.yml

tests/expectations/jsonapi.json

tests/expectations/jsonapi.openapi_test_entity.camelids.json

tests/expectations/jsonapi.openapi_test_entity.json

...jsonapi.openapi_test_entity.openapi_test_entity_test.json

tests/expectations/jsonapi.openapi_test_entity_type.json

tests/expectations/jsonapi.taxonomy_term.camelids.json

tests/expectations/jsonapi.taxonomy_term.json

...xpectations/jsonapi.taxonomy_term.taxonomy_term_test.json

tests/expectations/jsonapi.user.json

tests/src/Functional/RequestTestJsonapi.php

tests/src/Kernel/JsonApiGeneratorTest.php