Switch PHPUnit test install script to use git
instead of svn
#844
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Description of the Change
SVN is no longer installed within GitHub Actions so our PHPUnit workflow is failing. We could install SVN as part of that workflow (which I may try if this doesn't work) but we should also be able to use git to install things.
This is copied from the work done in 10up/ElasticPress#4058
How to test the Change
Ensure the PHPUnit checks pass on this PR
Changelog Entry
Credits
Props @dkotter, @felipeelia
Checklist: