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a01ada4e - Turbopack: Use readFileSync / writeFileSync for manifest writing (#83694)

Turbopack: Use readFileSync / writeFileSync for manifest writing (#83694) ## What? Use sync fs methods for reading/writing manifests after a Turbopack writeToDisk. Next step will be not calling it when nothing changed. Before: ``` GET / 200 in 41ms GET / 200 in 54ms GET / 200 in 57ms GET / 200 in 165ms GET / 200 in 44ms GET / 200 in 52ms GET / 200 in 42ms GET / 200 in 50ms GET / 200 in 39ms GET / 200 in 53ms GET / 200 in 39ms GET / 200 in 49ms GET / 200 in 40ms GET / 200 in 49ms GET / 200 in 40ms GET / 200 in 54ms GET / 200 in 39ms GET / 200 in 52ms GET / 200 in 47ms GET / 200 in 50ms GET / 200 in 45ms GET / 200 in 59ms GET / 200 in 44ms GET / 200 in 55ms GET / 200 in 46ms GET / 200 in 51ms ``` After: ``` GET / 200 in 31ms GET / 200 in 29ms GET / 200 in 32ms GET / 200 in 33ms GET / 200 in 33ms GET / 200 in 34ms GET / 200 in 32ms GET / 200 in 30ms GET / 200 in 33ms GET / 200 in 30ms GET / 200 in 31ms GET / 200 in 32ms GET / 200 in 31ms GET / 200 in 31ms GET / 200 in 30ms GET / 200 in 33ms GET / 200 in 33ms GET / 200 in 32ms GET / 200 in 29ms GET / 200 in 30ms GET / 200 in 36ms GET / 200 in 35ms GET / 200 in 34ms GET / 200 in 32ms GET / 200 in 30ms ```