Assume that all parachain peers know all paraheads #5514

Job	Run time
test-32bits	7m 58s
check-no-std	1m 31s
test-64bits	9m 30s
check-features	6m 10s
wasm-node-check	5m 15s
cargo-deny (bans licenses sources)	26s
check-rustdoc-links	50s
clippy	38s
cargo-spellcheck	21s
fmt	28s
wasm-node-versions-match	32s
all-ci	1s
	33m 40s

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