[AHM] pause scheduler during migration #2929

Job	Run time
Extract tasks from matrix	4s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://try-runtime.polkadot.io:443, ...	10s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://try-runtime-kusama.polkadot...	32m 59s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	1m 18s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	53s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	1m 11s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	19s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	19s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	52s
check-migrations (coretime-polkadot, coretime-polkadot-runtime, system-parachains/coretime/coreti...	1m 8s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	50s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	25m 40s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	1m 7s
All migrations passed	0s
	1h 6m 50s

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