test: editable install cover package navigation

[LecrisUT]

TODO:

• [ ] Add test-cases for relative navigation
  • [x] python-python navigation (py1_pkg.py1_module -> py2_pkg.py2_module)
  • [ ] namespace-python-python navigations ((ns1)py3_pkg.pya_module -> (ns2)py3_pkg.pyb_module)
  • [ ] c-c nagivation ((_c_lib.so)c1_pkg.c1_module -> (_c_lib.so)c2_pkg.c2_module; (_c3_lib.so)c3_pkg.c3_module -> (_c4_lib.so)c4_pkg.c4_mdoule)
  • [ ] Mixed packaging (shared_pkg.c1_pkg.c1_module with c1_pkg and c1_module in the same .so file; shared_pkg.c1_pkg.py2_module with py2_module from python)
• [ ] Fix python-python navigation
• [ ] Fix c-python navigation

Naming could be a bit cumbersome. Is there a convention or some reusable structure that we can import

[LecrisUT]

Hmm these are still failing, I guess because they cover the .. navigation case. ~~The error log is not quite descriptive though~~. Oh, nvm found the log and the typo