Fall back to FindAllReferences if GoToDefinition have not navigated (#16512)

Follow-up of https://github.com/zed-industries/zed/pull/9243 

Release Notes:

- N/A

---------

Co-authored-by: Alex Kladov <aleksey.kladov@gmail.com>

crates/project/src/project.rs

@@ -232,6 +232,7 @@ pub struct Project {
     cached_shell_environments: HashMap<WorktreeId, HashMap<String, String>>,
 }
 
+#[derive(Debug)]
 pub enum LanguageServerToQuery {
     Primary,
     Other(LanguageServerId),