toolchains: Add support for relative paths (#27777)

Closes #ISSUE

Release Notes:

- N/A

crates/project/src/terminals.rs

@@ -1,4 +1,4 @@
-use crate::Project;
+use crate::{Project, ProjectPath};
 use anyhow::{Context as _, Result};
 use collections::HashMap;
 use gpui::{AnyWindowHandle, App, AppContext as _, Context, Entity, Task, WeakEntity};
@@ -407,14 +407,17 @@ impl Project {
         cx: &Context<Project>,
     ) -> Task<Option<PathBuf>> {
         cx.spawn(async move |this, cx| {
-            if let Some((worktree, _)) = this
+            if let Some((worktree, relative_path)) = this
                 .update(cx, |this, cx| this.find_worktree(&abs_path, cx))
                 .ok()?
             {
                 let toolchain = this
                     .update(cx, |this, cx| {
                         this.active_toolchain(
-                            worktree.read(cx).id(),
+                            ProjectPath {
+                                worktree_id: worktree.read(cx).id(),
+                                path: relative_path.into(),
+                            },
                             LanguageName::new("Python"),
                             cx,
                         )