Explicitly connect an ambiguous import path case logic with the test on it

Author: SomeoneToIgnore

crates/hir_def/src/find_path.rs

@@ -141,7 +141,12 @@ fn find_path_inner(
                 })
                 .is_some();
             return Some(ModPath::from_segments(
-                if name_already_occupied_in_type_ns { PathKind::Abs } else { PathKind::Plain },
+                if name_already_occupied_in_type_ns {
+                    cov_mark::hit!(ambiguous_crate_start);
+                    PathKind::Abs
+                } else {
+                    PathKind::Plain
+                },
                 vec![name],
             ));
         }

crates/ide_assists/src/handlers/auto_import.rs

@@ -980,6 +980,7 @@ mod bar {
 
     #[test]
     fn uses_abs_path_with_extern_crate_clash() {
+        cov_mark::check!(ambiguous_crate_start);
         check_assist(
             auto_import,
             r#"