Revert "Add pyproject.toml"

[AnandInguva]

Reverts #28385

[codecov]

Codecov Report

Merging #28993 (566afcf) into master (47d0fd5) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #28993   +/-   ##
=======================================
  Coverage   38.39%   38.40%           
=======================================
  Files         686      686           
  Lines      101624   101595   -29     
=======================================
- Hits        39022    39020    -2     
+ Misses      61023    60996   -27     
  Partials     1579     1579           

Flag	Coverage Δ
go	53.42% <ø> (ø)

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Files	Coverage Δ
sdks/python/apache_beam/runners/common.py	68.64% <ø> (-0.04%)	⬇️
...s/python/apache_beam/runners/portability/stager.py	23.64% <ø> (-0.02%)	⬇️
sdks/python/gen_protos.py	0.00% <ø> (ø)
sdks/python/setup.py	0.00% <ø> (ø)

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