Kusama: remove migrations applied by `spec_version: 1_000_000` (#73) #40

Job	Run time
Extract tasks from matrix	5s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://polkadot-try-runtime-node.par...	20m 53s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://kusama-try-runtime-node.par...	17m 59s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	16m 35s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	16m 12s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	15m 23s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	15m 0s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	15m 40s
	1h 57m 47s

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