Add #[track_caller] to test utilities that involve marked text (#32043)

Release Notes:

- N/A

crates/editor/src/test/editor_test_context.rs

@@ -109,6 +109,7 @@ impl EditorTestContext {
         }
     }
 
+    #[track_caller]
     pub fn new_multibuffer<const COUNT: usize>(
         cx: &mut gpui::TestAppContext,
         excerpts: [&str; COUNT],
@@ -351,6 +352,7 @@ impl EditorTestContext {
     /// editor state was needed to cause the failure.
     ///
     /// See the `util::test::marked_text_ranges` function for more information.
+    #[track_caller]
     pub fn set_state(&mut self, marked_text: &str) -> ContextHandle {
         let state_context = self.add_assertion_context(format!(
             "Initial Editor State: \"{}\"",
@@ -367,6 +369,7 @@ impl EditorTestContext {
     }
 
     /// Only change the editor's selections
+    #[track_caller]
     pub fn set_selections_state(&mut self, marked_text: &str) -> ContextHandle {
         let state_context = self.add_assertion_context(format!(
             "Initial Editor State: \"{}\"",