Test runner improvements

[jcapona]

Status	Ticket/Issue
Ready/Hold	Ticket

Main changes

• Re-add camera tests.
• Add thread stop conditions on exit.
• Use pytest-xdist to run tests in multiple CPUs and speed up test execution.
• Use pytest.mark.parameterized instead of parameterized module.
• Convert unittest.TestCases into pytest tests.
• Cache python dependencies to reduce workflow run times.
• Cache shape predictors used in face detector tests.

Screenshots (feature, test output, profiling, dev tools etc)

[insert screenshots here]

Other notes (e.g. implementation quirks, edge cases, questions / issues)

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Manual testing tips

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Tag anyone who definitely needs to review or help

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[codecov[bot]]

Codecov Report

Merging #536 (01a033a) into master (3682e9f) will increase coverage by 1.18%. The diff coverage is 29.41%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
+ Coverage   49.07%   50.26%   +1.18%     
==========================================
  Files         146      146              
  Lines        6877     6902      +25     
==========================================
+ Hits         3375     3469      +94     
+ Misses       3502     3433      -69     

Flag	Coverage Δ
unittests	50.26% <29.41%> (+1.18%)	:arrow_up:

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

Impacted Files	Coverage Δ
pitop/miniscreen/oled/core/lock.py	0.00% <0.00%> (ø)
pitop/pma/ultrasonic_sensor_base.py	46.78% <11.11%> (-1.22%)	:arrow_down:
pitop/common/ptdm.py	90.86% <40.00%> (-0.70%)	:arrow_down:
.../robotics/navigation/core/measurement_scheduler.py	87.50% <57.14%> (-8.66%)	:arrow_down:
pitop/robotics/navigation/navigation_controller.py	90.72% <60.00%> (-0.86%)	:arrow_down:
pitop/processing/core/load_models.py	44.89% <0.00%> (-40.82%)	:arrow_down:
pitop/robotics/navigation/core/goal_criteria.py	96.42% <0.00%> (+7.14%)	:arrow_up:
pitop/common/formatting.py	38.46% <0.00%> (+7.69%)	:arrow_up:
pitop/camera/core/capture_actions/store_frame.py	100.00% <0.00%> (+8.33%)	:arrow_up:
pitop/camera/core/capture_actions/video_capture.py	92.30% <0.00%> (+15.38%)	:arrow_up:
... and 5 more

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