feat!: Return actionable errors from Manifest validation #561

Job	Run time
build_client_native / build client native on ubuntu-latest	38s
build_notary / notary on ubuntu-latest	50s
build_client_native / build client native on macos-latest	1m 8s
check / check (clippy, web-prover-notary)	1m 8s
build_notary / notary on macos-latest	2m 9s
check / check (clippy, web-prover-client)	36s
check / check (clippy, web-prover-core)	26s
check / check (test, web-prover-notary)	2m 33s
check / check (test, web-prover-client)	1m 37s
check / check (test, web-prover-core)	28s
check / check (udeps, web-prover-notary)	1m 3s
check / check (udeps, web-prover-client)	1m 1s
check / check (udeps, web-prover-core)	24s
check / check (fmt, all)	24s
release	0s
deploy_notary_staging_gcs	0s
deploy_notary_staging	0s
	14m 25s

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