Revert dubious retry in vulpix #21801
                
     Merged
            
            
          
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Revert #17373 which introduced a retry in the test rig, but of dubious utility.
At some point, I stopped seeing those timeouts. I never found a root cause; I don't see timeouts using 3.3.0 and JDK 17. This is under WSL2/Ubuntu.
Also use@nowarnforUnsafeAPI.