Governance migration Relay->AH

[bkontur]

Relates to: polkadot-fellows/runtimes#558

Context

We are migrating the governance system from the relay chain to AssetHub (migration itself here: polkadot-fellows/runtimes#558).

One aspect is ensuring that data and pallets are migrated from the relay chain, but equally important is making sure that other chains (relay chain and (system) parachains) reflect these changes.

Changes

We need to:

• Adjust configurations (XCM, root, etc.), for example:
  • Enable unpaid execution for governance systems on system parachains (SPs).
  • Configure waived locations for governance systems on SPs.
  • Ensure that system parachains accept RuntimeOrigin::root from AssetHub instead of the relay chain.
  • Ensure that the relay chain accepts RuntimeOrigin::root from AssetHub.
• Ensure that authorize_upgrade works after AHM:
  • For the relay chain – we must be able to upgrade the relay chain Ensure that the relay chain can accept authorize_upgrade from the AssetHub and/or Collectives governance systems. #7541.
  • For the system parachain – we must be able to upgrade the system parachain Ensure that the system parachains can accept XCM calls (authorize_upgrade) from the AssetHub and/or Collectives governance systems. #7566.
• Ensure data integrity OpenGov Call + Preimage data migration and integrity #7577.

Most of the changes can/should be released, fixed, and tested as a pre-migration step before the AHM migration is triggered.

Testing

• add emulated tests for authorize_upgrade at least

Documentation, examples, forum

• We need to ensure that other parachains also reflect these relevant changes.