[Consensus Observer] Parallelize message processing logic. #68292

Job	Run time
file_change_determinator	12s
rust-doc-tests	5m 14s
rust-unit-tests	0s
rust-consensus-only-unit-test	0s
rust-consensus-only-smoke-test	0s
rust-lints	3m 28s
rust-cargo-deny	1m 37s
general-lints	39s
rust-check-merge-base	1m 42s
rust-smoke-tests	29m 8s
rust-build-cached-packages	2m 4s
rust-cryptohasher-domain-separation-check	0s
rust-targeted-unit-tests	11m 40s
	55m 44s

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