Run template tests

Add test to run `tox` warning-free in a subprocess. #2309

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Run time

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Job	Run time
test macos-latest py3.12	53s
test ubuntu-latest py3.12	55s
test ubuntu-latest py3.11	58s
test windows-latest py3.13	58s
test macos-latest py3.11	1m 6s
test macos-latest py3.13	1m 2s
test windows-latest py3.12	59s
test windows-latest py3.11	57s
test ubuntu-latest py3.13	56s
	8m 44s