Proto/Michelson: remove legacy behaviour related to contract type
Context
Part of #2024 (more to come).
Manually testing the MR
We need to check that all mainnet contracts still typecheck after this MR
Checklist
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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.rstfor the protocol and the environment,CHANGES.rstat the root of the repository for everything else). -
Select suitable reviewers using the Reviewersfield below. -
Select as Assigneethe next person who should take action on that MR
Edited by Mehdi Bouaziz