Add Snowbridge initialize migration on Westend #8871

Job	Run time
preflight / preflight	42s
check-runtime-migration (westend)	6m 35s
check-runtime-migration (rococo)	4m 32s
check-runtime-migration (asset-hub-westend)	4m 14s
check-runtime-migration (asset-hub-rococo)	5m 44s
check-runtime-migration (bridge-hub-westend)	3m 46s
check-runtime-migration (bridge-hub-rococo)	3m 51s
check-runtime-migration (contracts-rococo)	3m 53s
check-runtime-migration (collectives-westend)	3m 49s
check-runtime-migration (coretime-rococo)	4m 5s
All runtime migrations passed	1s
	41m 12s

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