[CHORE tests] Added explicit -json-api serializer registration in tests #6369
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The intent of this PR is to mirror #6368 but for -json-api fallback behavior.
RFC-522 will deprecate the -json-api serializer and usage of the adapter.defaultSerializer fallback which for the JSONAPIAdapter is set to -json-api. This PR entirely removes our reliance on this fallback from our own test suite.
Part of #6166
Co-Authored-By: Eric Kelly @HeroicEric