Allow configuration of worst case buy execution weight #17161

Job	Run time
isdraft / isdraft	1s
preflight / preflight	9s
preflight / ci-versions	1m 1s
build-linux-stable	25s
build-linux-stable-cumulus	27s
build-test-collators	27s
build-linux-substrate	17s
build-malus	17s
build-test-parachain	17s
prepare-bridges-zombienet-artifacts	15s
prepare-cumulus-zombienet-artifacts	7s
prepare-polkadot-zombienet-artifacts	5s
build-push-image-polkadot-debug	1s
build-push-image-substrate-pr	1s
build-push-image-polkadot-parachain-debug	1s
build-push-image-bridges-zombienet-tests	1s
build-push-image-test-parachain	1s
build-push-image-colander	1s
build-push-image-malus	1s
	3m 55s

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