Remove Paris from Tezt

What

A first step to freeze Paris protocol.

Next step: !16427 (merged)

Why

Paris is not active in any network.

How

• Remove the tests from src/proto_020_PsParisC/
• Adapt the manifest
• Remove Paris tezt/test and tezt/lib_protocol

Manually testing the MR

Checklist

• 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