lsp: Identify language servers by their configuration (#35270)

- **WIP: reorganize dispositions**
- **Introduce a LocalToolchainStore trait and use it for LspAdapter
methods**

Closes #35782
Closes #27331

Release Notes:

- Python: Improved propagation of a selected virtual environment into
the LSP configuration. This should the make all language-related
features such as Go to definition or Find all references more reliable.

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Lukas Wirth <lukas@zed.dev>

crates/project/src/project_tests.rs

@@ -1099,9 +1099,9 @@ async fn test_reporting_fs_changes_to_language_servers(cx: &mut gpui::TestAppCon
     let prev_read_dir_count = fs.read_dir_call_count();
 
     let fake_server = fake_servers.next().await.unwrap();
-    let (server_id, server_name) = lsp_store.read_with(cx, |lsp_store, _| {
-        let (id, status) = lsp_store.language_server_statuses().next().unwrap();
-        (id, status.name.clone())
+    let server_id = lsp_store.read_with(cx, |lsp_store, _| {
+        let (id, _) = lsp_store.language_server_statuses().next().unwrap();
+        id
     });
 
     // Simulate jumping to a definition in a dependency outside of the worktree.
@@ -1110,7 +1110,6 @@ async fn test_reporting_fs_changes_to_language_servers(cx: &mut gpui::TestAppCon
             project.open_local_buffer_via_lsp(
                 lsp::Url::from_file_path(path!("/the-registry/dep1/src/dep1.rs")).unwrap(),
                 server_id,
-                server_name.clone(),
                 cx,
             )
         })