Migrate `pallet-tips` to umbrella crate #18838

Job	Run time
preflight / preflight	1m 21s
preflight / ci-versions	1m 4s
check-runtime-migration (westend)	7m 29s
check-runtime-migration (asset-hub-westend)	5m 26s
check-runtime-migration (bridge-hub-westend)	4m 41s
check-runtime-migration (collectives-westend)	4m 47s
check-runtime-migration (coretime-westend)	4m 59s
All runtime migrations passed	1s
	29m 48s

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