62221 Parallelise the performance tests #8190
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This change splits the "current", "before", and "base" performance tests out into a matrix so they run in parallel instead of one after the other in a single job. This shaves off almost 20 minutes from the performance workflow run.
An added benefit is that it removes the potential for to test runs to interfere with one another. They now run in isolation and don't need to rely on running the database upgrade, flushing the cache, and deleting transients between test runs.
Todo
Trac ticket: https://core.trac.wordpress.org/ticket/62221