[#24515] Remove JRH as option for Dataflow python

[lukecwik]

This cleans-up a lot of logic related to flag setting with respect to streaming and runner v2 experiments. There is also some dead code removed for configurations not possible any more (e.g. side input override, JRH Create, ...)

This is towards #24515

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[lukecwik]

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[codecov]

Codecov Report

Merging #24513 (43ed75a) into master (53bcb39) will decrease coverage by 0.01%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master   #24513      +/-   ##
==========================================
- Coverage   73.36%   73.35%   -0.02%     
==========================================
  Files         719      719              
  Lines       97206    97122      -84     
==========================================
- Hits        71320    71248      -72     
+ Misses      24538    24526      -12     
  Partials     1348     1348              

Flag	Coverage Δ
python	82.98% <97.05%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...dks/python/apache_beam/options/pipeline_options.py	93.95% <ø> (-0.02%)	⬇️
...s/python/apache_beam/runners/portability/stager.py	87.04% <ø> (-0.18%)	⬇️
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.00% <96.49%> (-0.56%)	⬇️
...apache_beam/runners/dataflow/internal/apiclient.py	76.72% <100.00%> (-0.63%)	⬇️
...ache_beam/runners/dataflow/ptransform_overrides.py	98.66% <100.00%> (+7.75%)	⬆️
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	⬇️
.../apache_beam/runners/interactive/dataproc/types.py	93.10% <0.00%> (-3.45%)	⬇️
...python/apache_beam/runners/worker/worker_status.py	75.33% <0.00%> (-1.34%)	⬇️
...che_beam/runners/interactive/interactive_runner.py	90.50% <0.00%> (-1.27%)	⬇️
... and 5 more

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[lukecwik]

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[lukecwik]

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[lukecwik]

CC: @tvalentyn @chamikaramj @robertwb @kennknowles

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[lukecwik]

Run Python Dataflow V2 ValidatesRunner

[lukecwik]

Run PubsubIO Performance Test Python

[lukecwik]

Tested within google with cl/492869422, also contains patches for import into Google