Add JSON:API performance tests

Problem/Motivation

Spin off from ✨ Introduce a list of "common cache tags" to reduce lookup query amount Active .

We should add performance test coverage of JSON:API, currently this will need to be FunctionalJavascript testing which isn't technically needed for JSON:API but should work as long as it's for GET requests.

We could also add a FunctionalTest version of PerformanceTestBase using PerformanceTestTrait which skips all the chromedriver-specific logic, this might require a bit of moving things around, but not too much hopefully.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet