Use a boolean instead of passing `&self.file_directive` #18251

Job	Run time
deploy-target	11s
build-wasm (web)	28s
build	2m 32s
build-wasm (nodejs)	25s
publish-turbopack-npm-packages	0s
stable - x86_64-unknown-linux-gnu - node@16	41s
Upload Turbopack Bytesize metrics to Datadog	0s
Deploy preview tarball	2m 3s
Potentially publish release	0s
Deploy examples	0s
Release Stats	0s
	6m 20s

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