Cumulus: Remove some old scripts #17209

Job	Run time
isdraft / isdraft	1s
preflight / preflight	9s
preflight / ci-versions	1m 12s
build-linux-stable	8m 12s
build-linux-stable-cumulus	6m 57s
build-linux-substrate	4m 49s
build-malus	5m 46s
build-test-collators	6m 22s
build-test-parachain	5m 2s
prepare-bridges-zombienet-artifacts	5m 19s
prepare-polkadot-zombienet-artifacts	4m 49s
prepare-cumulus-zombienet-artifacts	2m 37s
build-push-image-substrate-pr	52s
build-push-image-test-parachain	1m 0s
build-push-image-malus	1m 59s
build-push-image-colander	2m 1s
build-push-image-polkadot-parachain-debug	1m 4s
build-push-image-polkadot-debug	2m 5s
build-push-image-bridges-zombienet-tests	3m 56s
	1h 4m 12s

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