[backport][test] Run PHP distribtests with make -j8 (#33831) #33834
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Related to #33795.
The tests are still OOMing, and I found that this distribtest script is still running
make -j ...
on a 16-core machine. Reducing it to8
to see if that helps. Example OOM:https://fusion2.corp.google.com/invocations/c306e6b9-24e3-498d-8971-3e914feea29b/log