fix(experimental-dts): make `--experimental-dts` to be compatible with `--clean` #761

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Job	Run time
test (ubuntu-latest, 18.x)	1m 48s
test (ubuntu-latest, 20.x)	1m 42s
test (windows-latest, 18.x)	3m 3s
test (windows-latest, 20.x)	3m 2s
release	0s
	9m 35s