Make `udeps` a Rust test #2340

Job	Run time
maybe-expedite	3s
lint	6m 52s
test (third-party, bincode, stable, false)	17m 18s
test (third-party, bincode, stable, true)	16m 57s
test (third-party, bincode, nightly, false)	15m 56s
test (third-party, bincode, nightly, true)	17m 1s
test (third-party, postcard, stable, false)	17m 39s
test (third-party, postcard, stable, true)	17m 47s
test (third-party, postcard, nightly, false)	16m 35s
test (third-party, postcard, nightly, true)	17m 7s
test (other, bincode, stable, false)	30m 40s
test (other, bincode, stable, true)	30m 21s
test (other, bincode, nightly, false)	36m 28s
test (other, bincode, nightly, true)	36m 49s
test (other, postcard, stable, false)	32m 52s
test (other, postcard, stable, true)	33m 54s
test (other, postcard, nightly, false)	36m 57s
test (other, postcard, nightly, true)	38m 20s
all-checks	1s
	6h 59m 37s

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