Inject venv environment via the toolchain (#36576)

Instead of manually constructing the venv we now ask the python
toolchain for the relevant information, unifying the approach of vent
inspection

Fixes https://github.com/zed-industries/zed/issues/27350

Release Notes:

- Improved the detection of python virtual environments for terminals
and tasks in remote projects.

crates/project/src/debugger/dap_store.rs

@@ -276,6 +276,7 @@ impl DapStore {
                             &binary.arguments,
                             &binary.envs,
                             binary.cwd.map(|path| path.display().to_string()),
+                            None,
                             port_forwarding,
                         )
                     })??;