Build

Node: Remove references to SignedObservation #13803

Job	Run time
algorand	7m 15s
ethereum	1m 3s
ethereum-upgrade	4m 13s
relayer-ethereum	1m 10s
node	2m 32s
solana	4m 46s
Aptos	3m 7s
cli	2m 42s
cosmwasm	2m 0s
Sui	2m 45s
terra	7m 15s
terra-2	9m 36s
wormchain	3m 57s
docker	6s
npm-packages	4s
prettier	16s
sdk_vaa	1m 16s
rust-lint-and-tests (cosmwasm/Cargo.toml)	2m 33s
rust-lint-and-tests (terra/Cargo.toml)	1m 46s
spellcheck	15s
rust-lint-and-tests (sdk/rust/Cargo.toml)	45s
tilt	1m 2s
node-lint	27s
node-tests	29s
	1h 1m 20s

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