surf: Add `DiffFile` to `FileDiff::Copied` and `FileDiff::Moved` #708

Job	Run time
build-linux (stable)	35s
build-windows	1m 44s
build-macos	46s
cargo-deny (advisories)	23s
build-linux (nightly)	45s
cargo-deny (bans licenses sources)	29s
docs	24s
fmt	19s
lint	35s
test-linux (stable)	55s
test-linux (nightly)	52s
test-macos	1m 16s
	9m 3s

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