Use a boolean instead of passing `&self.file_directive` #18238

Job	Run time
deploy-target	15s
build	2m 28s
publish-turbopack-npm-packages	0s
build-wasm (web)	5m 38s
build-wasm (nodejs)	3m 49s
stable - x86_64-unknown-linux-gnu - node@16	4m 6s
Deploy examples	0s
Upload Turbopack Bytesize metrics to Datadog	0s
Deploy preview tarball	2m 14s
Potentially publish release	0s
Release Stats	0s
	18m 30s

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