Migrate the remaining tests in `language-server` to the `presentation-compiler`

[hamzaremmal]

As of today, the old language-server is still released along side the presentation-compiler. That module is not used anymore and the consensus should be to retire it soon.
One blocker to the removal of the language-server is the presence of some tests that were not yet migrated to the presentation-compiler's test suite.
This ticket covers the migration of those tests and not the retirement of the language-server.