lsp/python: Temporarily report just a singular workspace folder instead of all of the roots (#35243)

Temporarily fixes #29133

Co-authored-by: Cole <cole@zed.dev>

Release Notes:

- python: Zed now reports a slightly different set of workspace folders
for Python projects to work around quirks in handling of multi-lsp
projects with virtual environment. This behavior will be revisited in a
near future.

Co-authored-by: Cole <cole@zed.dev>

crates/language/src/language.rs

@@ -313,6 +313,15 @@ impl Attach {
     }
 }
 
+/// Determines what gets sent out as a workspace folders content
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum WorkspaceFoldersContent {
+    /// Send out a single entry with the root of the workspace.
+    WorktreeRoot,
+    /// Send out a list of subproject roots.
+    SubprojectRoots,
+}
+
 /// [`LspAdapterDelegate`] allows [`LspAdapter]` implementations to interface with the application
 // e.g. to display a notification or fetch data from the web.
 #[async_trait]
@@ -606,6 +615,13 @@ pub trait LspAdapter: 'static + Send + Sync {
         Attach::Shared
     }
 
+    /// Determines whether a language server supports workspace folders.
+    ///
+    /// And does not trip over itself in the process.
+    fn workspace_folders_content(&self) -> WorkspaceFoldersContent {
+        WorkspaceFoldersContent::SubprojectRoots
+    }
+
     fn manifest_name(&self) -> Option<ManifestName> {
         None
     }