fix(app, api): expose failOnNotHomed parameter for save_position command

[mjhuff]

Overview

Drop tip flows require saving pipette positions without homing the plunger axis (we definitely do not want to home the plunger). The save_position command should optionally expose a failOnNotHomed parameter to prevent an error from being thrown when the plunger is not homed - the plunger position value is not stored in saved_position, anyway.

Test Plan

• Run the drop tip wizard flows on a pipette such as the P300 8-Channel GEN2 and confirm via Network tab that the save position response is successful. NOTE: Drop tip flows will work on the OT-2 without a deckmap, just click Move to Slot - there's a default position.
• Test the flows on a couple pipettes and Flex/OT-2 to confirm there aren't any unforeseen issues.

Changelog

• The savePosition command now takes an optional failOnNotHomed boolean.

Risk assessment

low

[codecov]

Codecov Report

Merging #14139 (f7a24b8) into chore_release-7.1.0 (7e765eb) will decrease coverage by 0.02%.
Report is 1 commits behind head on chore_release-7.1.0.
The diff coverage is n/a.

❗ Current head f7a24b8 differs from pull request most recent head d81f663. Consider uploading reports for the commit d81f663 to get more accurate results

Additional details and impacted files

@@                   Coverage Diff                   @@
##           chore_release-7.1.0   #14139      +/-   ##
=======================================================
- Coverage                70.44%   70.43%   -0.02%     
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  Files                     2512     1636     -876     
  Lines                    71197    54482   -16715     
  Branches                  8962     4016    -4946     
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- Hits                     50158    38372   -11786     
+ Misses                   18849    15416    -3433     
+ Partials                  2190      694    -1496     

Flag	Coverage Δ
app	38.56% <ø> (-29.07%)	⬇️
notify-server	89.13% <ø> (ø)
protocol-designer	44.99% <ø> (ø)
shared-data	75.02% <ø> (ø)
step-generation	86.84% <ø> (ø)

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

Files	Coverage Δ
...pentrons/protocol_engine/commands/save_position.py	100.00% <ø> (ø)

... and 877 files with indirect coverage changes

[sfoster1]

Nice, nice work doing both sides!