feat(step-generation): remove pd_step step wrapper

[ddcc4]

Overview

We had defined a pd_step context manager so that we could group Python commands from the same PD step together, and so that we could emit fields from PD that are not expressible in the Python API (step name, step description, step form parameters, etc.). We were planning to use it like this:

with pd_step(name="My Mix Step", description="Mix very well", ...):
  pipette_left.pick_up_tip()
  pipette_left.mix(...)

However, command annotations serve the same purpose, and command annotations will also provide a context manager for grouping steps. So I'm removing our pd_step context manager.

Command annotations are not available in the public API yet, but we'll just wait for it and use it when it's available.

Test Plan and Hands on Testing

Updated unit tests.

Risk assessment

Low. Feature has never been released publicly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.89%. Comparing base (f461d0f) to head (e43b20b).
Report is 1 commits behind head on chore_release-pd-8.5.0.

Additional details and impacted files

@@                   Coverage Diff                   @@
##           chore_release-pd-8.5.0   #18647   +/-   ##
=======================================================
  Coverage                   25.89%   25.89%           
=======================================================
  Files                        3256     3256           
  Lines                      281301   281303    +2     
  Branches                    28539    28555   +16     
=======================================================
+ Hits                        72835    72854   +19     
+ Misses                     208439   208422   -17     
  Partials                       27       27           

Flag	Coverage Δ
protocol-designer	19.11% <100.00%> (+<0.01%)	⬆️
step-generation	5.18% <0.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
step-generation/src/utils/pythonFileUtils.ts	88.35% <100.00%> (-0.12%)	⬇️

... and 1 file with indirect coverage changes

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[jerader]

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