Convert remaining tests to use PerformanceTestTrait::assertMetrics()

Problem/Motivation

Follow up from 📌 Add PerformanceTestTrait::assertMetrics() so it is easier to write performance tests Active was decided to go ahead with the trait even though there are new tests that need to be converted. So need go back and convert those.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet