Update ParticleType repr #280

Job	Run time
mypy	3m 51s
py3.12 \| macos \| unit tests	9m 14s
py3.12 \| macos \| integration tests	9m 3s
py3.12 \| ubuntu \| unit tests	9m 1s
py3.12 \| ubuntu \| integration tests	9m 1s
py3.12 \| windows \| unit tests	8m 56s
py3.12 \| windows \| integration tests	8m 55s
py3.10 \| ubuntu \| unit tests	9m 8s
py3.11 \| ubuntu \| unit tests	9m 13s
merge-test-artifacts	1s
	1h 16m 23s

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