use gcp runners for fullnode-sync workflows #67913

Job	Run time
file_change_determinator	11s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-doc-tests	4m 44s
rust-unit-tests	0s
rust-lints	3m 28s
rust-cargo-deny	1m 42s
general-lints	27s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	27m 45s
rust-build-cached-packages	1m 56s
rust-targeted-unit-tests	1m 32s
rust-check-merge-base	1m 12s
	42m 57s

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