Revert "Default to Runner v2 for Python Streaming jobs."

[angoenka]

Reverts #15140

[angoenka]

Waiting for the tests to pass before merging

[codecov]

Codecov Report

Merging #15210 (8fba88e) into master (6e54d4c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #15210   +/-   ##
=======================================
  Coverage   83.82%   83.83%           
=======================================
  Files         441      441           
  Lines       59711    59706    -5     
=======================================
+ Hits        50053    50054    +1     
+ Misses       9658     9652    -6     

Impacted Files	Coverage Δ
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.81% <100.00%> (+0.42%)	⬆️
sdks/python/apache_beam/internal/metrics/metric.py	86.17% <0.00%> (-1.07%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.51% <0.00%> (-0.13%)	⬇️
...eam/runners/interactive/interactive_environment.py	90.70% <0.00%> (+0.37%)	⬆️
...runners/interactive/display/pcoll_visualization.py	85.78% <0.00%> (+0.52%)	⬆️
...pache_beam/runners/interactive/interactive_beam.py	76.59% <0.00%> (+1.06%)	⬆️

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