chore(conductor): send boxed objects over channels #7407

Job	Run time
run_checker / changes	5s
protos-compiled	59s
lockfile	43s
compiles	9m 49s
solidity-contracts-compiled	1m 43s
doctest	6m 10s
audit	0s
rust	5m 26s
rust-ethereum	2m 19s
clippy	3m 46s
custom-lints	4m 39s
test / success	1s
	35m 40s

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