Revert to 1 node cluster for YAML tests and avoid wait for green #94385
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I have reviewed the tests that motivated the use of a two node cluster for the YAML tests. It seems there is no reason anymore to use
wait_for_status: greenandnumber_of_replicas: 0since the default values make sure the write will succeed. There are many newer YAML tests where an index creation is followed by an index operation, w/o waiting for green. With this PR, I'm reverting the changes in #94304, and instead modify the tests.