What

Ensure delegates are correctly forbidden/deactivated after Migration to Paris. Checks deactivation delays are changed according to new constants.

Why

To avoid surprises after activation. In particular, ensure inactive delegates are still deactivated and new constants are used as expected.

dune exec tezt/tests/main.exe -- --file protocol_migration.ml --title "protocol migration with deactivations" --info

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR