[BEAM-11715] [cherry-pick] Partial revert of "Combiner packing in Dataflow" (#13763)

[yifanmai]

This reverts the use of translations.pack_combiners in DataflowRunner added in #13763, but preserves other changes (i.e. minor bug fix in translations.pack_combiners, disabling optimizations by default, and testing that translations.pack_combiners is disabled).

This reason for the revert is that translations.pack_combiners results in packed CombinePerKey transforms without subtransforms which is not accepted by Dataflow, and that Pipeline.from_runner_api will break cross-language pipelines

Cherry-pick of #13884.

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Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang				---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---		---	---	---	---

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GitHub Actions Tests Status (on master branch)

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[yifanmai]

R: @chamikaramj

[codecov]

Codecov Report

Merging #13901 (3903998) into release-2.28.0 (091cd88) will increase coverage by 0.00%.
The diff coverage is 56.52%.

@@               Coverage Diff               @@
##           release-2.28.0   #13901   +/-   ##
===============================================
  Coverage           82.84%   82.85%           
===============================================
  Files                 466      466           
  Lines               57584    57570   -14     
===============================================
- Hits                47705    47699    -6     
+ Misses               9879     9871    -8     

Impacted Files	Coverage Δ
...ache_beam/runners/dataflow/ptransform_overrides.py	90.36% <ø> (-0.70%)	⬇️
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.28% <44.44%> (-0.75%)	⬇️
...apache_beam/runners/portability/portable_runner.py	75.88% <100.00%> (+1.33%)	⬆️
...ks/python/apache_beam/runners/worker/data_plane.py	89.52% <0.00%> (-1.80%)	⬇️
sdks/python/apache_beam/dataframe/frames.py	91.15% <0.00%> (-0.83%)	⬇️
...apache_beam/runners/dataflow/internal/apiclient.py	73.13% <0.00%> (-0.35%)	⬇️
setup.py	0.00% <0.00%> (ø)
...hon/apache_beam/runners/worker/bundle_processor.py	93.83% <0.00%> (ø)
sdks/python/apache_beam/io/iobase.py	84.81% <0.00%> (+0.26%)	⬆️
... and 2 more

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