[BEAM-14231] Revert "[BEAM-14190] Python sends dataflow schema field"

[kileys]

This reverts commit c50f562.

Please add a meaningful description for your change here

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Choose reviewer(s) and mention them in a comment (R: @username).
• Format the pull request title like [BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replace BEAM-XXX with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[codecov]

Codecov Report

Merging #17255 (c2cdd75) into master (0ab181f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17255   +/-   ##
=======================================
  Coverage   74.16%   74.17%           
=======================================
  Files         675      675           
  Lines       88901    88896    -5     
=======================================
+ Hits        65934    65935    +1     
+ Misses      21832    21826    -6     
  Partials     1135     1135           

Flag	Coverage Δ
python	83.68% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/coders/row_coder.py	97.00% <ø> (-0.15%)	⬇️
...ks/python/apache_beam/runners/worker/data_plane.py	87.50% <0.00%> (-1.71%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.64% <0.00%> (+0.12%)	⬆️
...eam/runners/interactive/interactive_environment.py	90.51% <0.00%> (+0.30%)	⬆️
...runners/interactive/display/pcoll_visualization.py	86.36% <0.00%> (+0.50%)	⬆️
...pache_beam/runners/interactive/interactive_beam.py	81.81% <0.00%> (+0.72%)	⬆️
...eam/runners/portability/fn_api_runner/execution.py	93.06% <0.00%> (+0.80%)	⬆️
.../python/apache_beam/transforms/periodicsequence.py	98.36% <0.00%> (+1.63%)	⬆️
sdks/python/apache_beam/utils/interactive_utils.py	95.12% <0.00%> (+2.43%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0ab181f...c2cdd75. Read the comment docs.

[apilloud]

LGTM