Remove old crypto proto directory (#4752) #520

Job	Run time
xtask (format)	6m 24s
xtask (check-format)	6m 21s
xtask (run-cargo-deny)	5m 51s
xtask (run-cargo-udeps)	10m 22s
xtask (run-cargo-tests)	18m 21s
xtask (run-bazel-tests)	29m 54s
xtask (run-cargo-fuzz -- -max_total_time=2)	5m 48s
xtask (completion)	5m 55s
xtask (run-cargo-clippy)	13m 42s
	1h 42m 38s

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