Cumulus: Remove some old scripts #23643

Job	Run time
isdraft / isdraft	1s
check-dependency-rules	20s
check-fail-ci	12s
check-readme	3m 11s
check-markdown	14s
check-workspace	27s
preflight / preflight	9s
preflight / ci-versions	1m 14s
check-rust-feature-propagation	1m 59s
check-toml-format	1m 8s
fmt	1m 15s
check-umbrella	2m 12s
test-rust-features	2m 16s
All quick checks passed	1s
	14m 39s

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