Revert "[BEAM-1833] Preserve inputs names at graph construction and t…

[emilymye]

…hrough proto transaltion. (#15202)"

This reverts commit 939fa99.

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ValidatesRunner compliance status (on master branch)

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

Examples testing status on various runners

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

Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

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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[emilymye]

Run Python 3.7 PostCommit

[codecov]

Codecov Report

Merging #15251 (636cac9) into master (37d71e2) will increase coverage by 0.01%.
The diff coverage is 96.96%.

@@            Coverage Diff             @@
##           master   #15251      +/-   ##
==========================================
+ Coverage   83.83%   83.85%   +0.01%     
==========================================
  Files         441      441              
  Lines       59724    59723       -1     
==========================================
+ Hits        50069    50078       +9     
+ Misses       9655     9645      -10     

Impacted Files	Coverage Δ
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.81% <ø> (ø)
sdks/python/apache_beam/pipeline.py	91.60% <92.85%> (-0.07%)	⬇️
...he_beam/runners/interactive/pipeline_instrument.py	99.47% <100.00%> (ø)
sdks/python/apache_beam/transforms/ptransform.py	93.60% <100.00%> (+0.05%)	⬆️
...hon/apache_beam/runners/worker/bundle_processor.py	93.39% <0.00%> (+0.12%)	⬆️
...ks/python/apache_beam/runners/worker/data_plane.py	92.42% <0.00%> (+1.81%)	⬆️
...hon/apache_beam/runners/direct/test_stream_impl.py	96.26% <0.00%> (+2.23%)	⬆️

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