Remove block_mouse_down in favor of stop_mouse_events_except_scroll (#30401)

This method was added in #20649 to be an alternative of `occlude` which
allows scroll events. It seems a bit arbitrary to only stop left mouse
downs, so this seems like it's probably an improvement.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -15021,7 +15021,7 @@ impl Editor {
                                         text_style = text_style.highlight(highlight_style);
                                     }
                                     div()
-                                        .block_mouse_down()
+                                        .block_mouse_except_scroll()
                                         .pl(cx.anchor_x)
                                         .child(EditorElement::new(
                                             &rename_editor,