[Inspection Service] Add simple consensus health check endpoint. #71602

Job	Run time
file_change_determinator	13s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-doc-tests	0s
rust-unit-tests	0s
rust-cargo-deny	1m 45s
rust-lints	3m 31s
general-lints	26s
rust-check-merge-base	1m 23s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	0s
rust-targeted-unit-tests	8m 42s
rust-build-cached-packages	0s
	16m 0s

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