Update ParticleType repr #277

Job	Run time
mypy	3m 55s
py3.12 \| macos \| unit tests	9m 47s
py3.12 \| macos \| integration tests	15m 40s
py3.12 \| ubuntu \| unit tests	13m 30s
py3.12 \| ubuntu \| integration tests	18m 9s
py3.12 \| windows \| unit tests	21m 0s
py3.12 \| windows \| integration tests	31m 37s
py3.10 \| ubuntu \| unit tests	12m 21s
py3.11 \| ubuntu \| unit tests	12m 13s
merge-test-artifacts	0s
	2h 18m 12s

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