download ninja/gn from cipd #6170

Job	Run time
debug x86_64-apple-darwin	20m 37s
release x86_64-apple-darwin	21m 58s
asan aarch64-apple-darwin	1h 7m 29s
debug aarch64-apple-darwin	15m 14s
release aarch64-apple-darwin	13m 24s
debug x86_64-unknown-linux-gnu	13m 49s
release x86_64-unknown-linux-gnu	10m 40s
release x86_64-pc-windows-msvc	20m 0s
debug aarch64-unknown-linux-gnu	25m 10s
release aarch64-unknown-linux-gnu	12m 36s
publish	0s
	3h 40m 57s

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