Remove collation-generation subsystem from validator nodes #16026

Job	Run time
check-dependency-rules	7s
check-fail-ci	18s
check-markdown	14s
check-readme	3m 12s
check-workspace	14s
preflight / preflight	31s
preflight / ci-versions	1m 3s
check-rust-feature-propagation	2m 3s
fmt	1m 16s
check-toml-format	1m 4s
check-umbrella	2m 34s
test-rust-features	1m 59s
All quick checks passed	1s
	14m 36s

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