* Introduce abstractions: FileCollection, FileProxy
* Unify handling of pattern search in project files
(source code vs. all files)
This prepares for processing of external files,
which can implement FileProxy differently.
Adds tests for name resolution for each language and fixes the name resolution where tests have failed.
Also:
Extends python tests to cover ty
Extends skipping conditions for several LS (but only when not in CI)
Better test output in CI
Removed a wrong python test (started failing for ty and should have failed for pyright too)
Dominik Jain