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/language/src/buffer.rs

@@ -1571,6 +1571,7 @@ impl Buffer {
             diagnostics: diagnostics.iter().cloned().collect(),
             lamport_timestamp,
         };
+
         self.apply_diagnostic_update(server_id, diagnostics, lamport_timestamp, cx);
         self.send_operation(op, true, cx);
     }