Add `Runtime::OmniNode` variant to `polkadot-parachain` #2626

Job	Run time
check-dependency-rules	11s
check-markdown	18s
check-workspace	20s
set-image	9s
fmt	1m 6s
check-rust-feature-propagation	1m 54s
check-umbrella	2m 7s
check-toml-format	59s
test-rust-features	1m 55s
	8m 59s

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