Revert !11695

What

Replug the slow tests which were unplugged in !11695 (merged).

Why

Because slow tests are now run in the scheduled pipeline and not in the CI.

How

By reverting !11695 (merged).

Manually testing the MR

dune exec src/proto_alpha/lib_protocol/test/integration/main.exe \
                   -- --file test_adaptive_issuance_launch.ml
dune exec src/proto_018_Proxford/lib_protocol/test/integration/main.exe \
                   -- --file test_adaptive_issuance_launch.ml

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