Respect `--project` in `uv version` (#13230)
Previously, we were using the wrong `Workspace` discovery and would
report the version of the workspace root, which would iterate up from
the `--project` directory and return the workspace root (with or without
a project in the root). Instead, we need `ProjectWorkspace` discovery
that returns the closest project.
This fixes `uv version --project <path>` where `<path>` belongs to a
workspace member.
Fixes #13213
