Contracts: Ensure latest migration match pallet_version

[pgherveou]

bot rebase

[paritytech-processbot[bot]]

Rebased

[athei]

There's already code in every pallets post_migrate hook (which are now run as part of CI) to ensure this. Does this provide anything extra on top of that?

Yes. The hook you mentioned checks that we did not forget a migration. This prevents the inverse case where we added a migration but forgot to bump the pallet version.

[pgherveou]

bot merge