Don't use `StringEnum` subclasses over Qt Signal definition #361

Job	Run time
ubuntu-latest, py3.9, napari repo	9m 33s
ubuntu-latest, py3.10, napari repo	10m 55s
ubuntu-latest, py3.11, napari repo	10m 39s
windows-latest, py3.9, napari repo	10m 25s
windows-latest, py3.10, napari repo	12m 13s
macos-13, py3.9, napari repo	11m 34s
macos-13, py3.10, napari repo	10m 21s
macos-13, py3.11, napari repo	12m 46s
deploy	0s
	1h 28m 26s

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