[python] Fixup python examples / build (#2509)

## Description

This fixes up and renables the python examples builds.

Main fixes
- Test shell script just straight up didn't do what it was intended to
do
- Replace analog imus (and half refactored sims) with OnboardIMU
- Fixes swerve velocities function signature
- "regenerates" the default robotpy test

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_, including events
that led to this PR
- [ ] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with all settings going back to the previous seasons's last release
(seasons end after champs ends)
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added
- [ ] If this PR adds a dependency, the license has been checked for
compatibility and steps taken to follow it

---------

Co-authored-by: Matt Morley <matthew.morley.ca@gmail.com>
Co-authored-by: David Vo <auscompgeek@users.noreply.github.com>

photonlib-python-examples/aimattarget/robot.py

@@ -69,6 +69,6 @@ class MyRobot(wpilib.TimedRobot):
 
         self.swerve.drive(xSpeed, ySpeed, rot, True, self.getPeriod())
 
-    def _simulationPeriodic(self) -> None:
+    def simulationPeriodic(self) -> None:
         self.swerve.simulationPeriodic()
-        return super()._simulationPeriodic()
+        return super().simulationPeriodic()