Add remote proxy support to AH Polkadot&Kusama #2751

Job	Run time
Extract tasks from matrix	4s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://try-runtime.polkadot.io:443, ...	38m 0s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://try-runtime-kusama.polkadot...	34m 12s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	1h 21m 13s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	1h 31m 6s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	24m 18s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	35m 50s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	25m 18s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	23m 18s
check-migrations (coretime-polkadot, coretime-polkadot-runtime, system-parachains/coretime/coreti...	22m 54s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	23m 31s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	23m 23s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	23m 17s
All migrations passed	1s
	7h 26m 25s

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