Python performance tests have been broken for a while. [BEAM-5334]

[Huygaa Batsaikhan]

Hi devs, regarding BEAM-5334
<https://issues.apache.org/jira/browse/BEAM-5334>,
beam_PerformanceTests_Python has been broken for a really long time. Anyone
interested in picking it up? Here is the history
<https://builds.apache.org/job/beam_PerformanceTests_Python/> of the test.
Thanks