Add `codeSubstitutes` to rococo parachains #1384

Job	Run time
check-markdown	16s
check-dependency-rules	9s
check-workspace	18s
set-image	8s
fmt	1m 21s
test-rust-features	2m 2s
check-rust-feature-propagation	2m 6s
check-toml-format	1m 6s
check-umbrella	2m 20s
	9m 46s

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