[BEAM-11522] Revert "Optimizes extract_output for 1 element accumulator case."

[tvalentyn]

Reverts #13220

Context: #13220 (comment)

[tvalentyn]

R: @y1chi @aaltay @pabloem

[y1chi]

LGTM. Thanks, Valentyn

[codecov]

Codecov Report

Merging #13612 (24ccdc7) into master (fbeb28e) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #13612      +/-   ##
==========================================
- Coverage   82.73%   82.72%   -0.01%     
==========================================
  Files         466      466              
  Lines       57522    57518       -4     
==========================================
- Hits        47589    47581       -8     
- Misses       9933     9937       +4     

Impacted Files	Coverage Δ
sdks/python/apache_beam/transforms/core.py	91.51% <100.00%> (-0.03%)	⬇️
sdks/python/apache_beam/dataframe/frames.py	90.90% <0.00%> (-0.42%)	⬇️
sdks/python/apache_beam/io/iobase.py	84.81% <0.00%> (-0.27%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.44% <0.00%> (-0.26%)	⬇️
sdks/python/apache_beam/io/localfilesystem.py	92.42% <0.00%> (+0.75%)	⬆️
sdks/python/apache_beam/utils/interactive_utils.py	92.85% <0.00%> (+4.76%)	⬆️

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[tvalentyn]

Seeing a strange linter flake:

17:33:08 apache_beam/dataframe/frames_test.py:1:0: F0002: <class 'RecursionError'>: maximum recursion depth exceeded while calling a Python object (astroid-error)

[tvalentyn]

Run PythonLint Precommit

[tvalentyn]

Run PythonLint Precommit