remove processing/scheduling logic from StreamingDataflowWorker

[m-trieu]

includes https://github.com/apache/beam/pull/31148

StreamingDataflowWorker will eventually just be constructing the harness runtime (different implementations for appliance, dispatched, fanout etc) and the main method.

R: @scwhittle

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[m-trieu]

test failure is unrelated @scwhittle

[scwhittle]

I think the examples failure is unrelated so don't bother investigating it.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.51%. Comparing base (5c30b1d) to head (8da5f40). Report is 42 commits behind head on master.

:exclamation: Current head 8da5f40 differs from pull request most recent head 570c4ef

Please upload reports for the commit 570c4ef to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #31317      +/-   ##
============================================
- Coverage     68.55%   68.51%   -0.05%     
+ Complexity    14921    14823      -98     
============================================
  Files          2636     2636              
  Lines        222080   221689     -391     
  Branches      11825    11784      -41     
============================================
- Hits         152238   151881     -357     
+ Misses        63647    63629      -18     
+ Partials       6195     6179      -16     

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[m-trieu]

run java precommit

[scwhittle]

Run Java PreCommit