fix!: Rename `runner` to `webExt` #2768

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Job	Run time
checks	22s
builds	23s
build-demo	23s
template (react)	20s
template (solid)	25s
windows-tests	2m 15s
tests	21s
template (svelte)	21s
template (vanilla)	31s
template (vue)	20s
	5m 41s