build: add @vitest/coverage-v8 as a peer dependency extension for vitest #10126

Job	Run time
build-e2e-windows	1m 18s
build	1m 17s
lint	1m 13s
test	1s
Browser Compatibility Tests	1s
publish-snapshots	1s
e2e-package-managers	1s
e2e-snapshots	1s
e2e	1s
e2e-windows	1s
	3m 55s

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