Don't use `StringEnum` subclasses over Qt Signal definition #362

Job	Run time
ubuntu-latest, py3.9, napari repo	6m 6s
ubuntu-latest, py3.10, napari repo	7m 50s
ubuntu-latest, py3.11, napari repo	6m 44s
windows-latest, py3.9, napari repo	8m 0s
windows-latest, py3.10, napari repo	8m 3s
macos-13, py3.9, napari repo	7m 16s
macos-13, py3.10, napari repo	8m 16s
macos-13, py3.11, napari repo	8m 40s
deploy	0s
	1h 0m 55s

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