[AHM] Misc Issues

[ggwpez]

TODO list of things we have to fix before going live:

• Add legacy variant for existing Proxy variants instead of silently increasing their permissions, see [AHM] Nomination pools polkadot-fellows/runtimes#562 (comment)
• Check pallet config constants to not go overweight now. On the relay a lot of these constants worked fine since we did not have a weight limit. Now on the AH we maybe have to reduce some of them.
• Check call-filter with owners from excel stakeholders sheet, see [AHM] Add Polkadot call filtering polkadot-fellows/runtimes#559 (review)
• If On-demand credits #5990 gets merged then we should change the filter, see [AHM] Add Polkadot call filtering polkadot-fellows/runtimes#559 (comment)
• Introduce origin filter to XCM pallet to allow Root and Parachain origins during the migration, see [AHM] Add Polkadot call filtering polkadot-fellows/runtimes#559 (comment)
• Custom origin to allow Fellows to do specific calls to unstuck the migration, see [AHM] Add Polkadot call filtering polkadot-fellows/runtimes#559 (comment)
• Finish and audit the MQ prioritization, [mq pallet] Custom next queue selectors #6059
• Test multiple pallets (maybe fuzz) to be disabled during the migration in addition to the current test, see [AHM] Add Polkadot call filtering polkadot-fellows/runtimes#559 (comment)
• Check that pallets that do block number translation still need it after possibly now using the RC number, see [AHM] Nomination pools polkadot-fellows/runtimes#562 (comment)
• Double-check that all storage entries are delete from the Relay. I was a bit unsure originally but now think that deleting is fine.
• Benchmark the AH extrinsics when integrating data
• Ensure that keyless accounts are accessible
• Check that all pallets have their user impact documented
• Treasury time config should be translated, see [AHM] referenda pallet polkadot-fellows/runtimes#558 (comment)
• Make the event here a bit smarter instead of copy&paste [AHM] Nomination pools polkadot-fellows/runtimes#562 (comment)
• Call filter also on the Asset Hub
• Check if we have to re-generate the bags list thresholds https://github.com/polkadot-fellows/runtimes/pull/563/files/5388bf5fd9c26478a09c2926fab892be6f9efdbb#diff-889f8debaa4273f13f5f7a32bc13a767c38c5dde39e7f36f12a28e57ef5d44fa
• Remove Legacy preimage fetching since we do not migrate legacy entries
• Check all on_initialize and possibly pasuse them