Test

Reject legend_loc='on data' loudly in pl.show() #1528

Job	Run time
get-environments	13s
hatch-test.py3.14-stable	1m 47s
hatch-test.py3.14-pre (PRE-RELEASE DEPENDENCIES)	1m 58s
hatch-test.py3.11-stable	1m 39s
Tests pass in all hatch environments	5s
	5m 42s

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