dune commands don't accept absolute paths

[Alizter]

There are various dune commands that don't accept absolute paths in the workspace directory. We have a way of improving this situation with Path.Expert.try_localize_external and we should try to do some more. There are other cases such as dune init which don't require a workspace directory, so that should be handled appropriately as well.

This issue serves to track other all the specific issues related to this problem. We should keep this list updated in order to track these issues.

• dune build
• dune exec dune should work with absolute paths #10536
  • fix feat(exec): support absolute paths for dune exec #12094
• dune runtest
  • fix feat(runtest): support absolute paths #11936
• dune init dune init project crashes with an absolute directory #7806
• dune ocaml top
• dune utop
• dune ocaml top-module
• dune install / uninstall
  • This is sort of dual to main issue here dune install doesn't process relative paths correctly #12241