This change introduces a job matrix for the "current", "before", and "base" performance tests to replace the current behaviour of running them sequentially in a single job. This speeds up the overall performance testing workflow and also reduces the chance of any given test interfering with another, for example by making a change to data in the database that affects a subsequent test.
Props johnbillion, swissspidy, dmsnell, joemcgill.
See #62221
git-svn-id: https://develop.svn.wordpress.org/trunk@59749 602fd350-edb4-49c9-b593-d223f7449a82
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