Add PoolAssetsExchanger to asset hubs #2765

Job	Run time
Extract tasks from matrix	4s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://try-runtime.polkadot.io:443, ...	38m 18s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://try-runtime-kusama.polkadot...	3h 8m 3s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	1h 43m 48s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	24m 21s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	35m 2s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	33m 46s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	24m 8s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	24m 1s
check-migrations (coretime-polkadot, coretime-polkadot-runtime, system-parachains/coretime/coreti...	24m 20s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	23m 8s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	23m 12s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	25m 20s
All migrations passed	1s
	9h 27m 32s

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