Debugger: Switch Breakpoint Anchor from left to right (#27688)

This fixes an edge case where some breakpoints would not render
correctly when expanding a conflict git hunk.

## Before 


https://github.com/user-attachments/assets/4fd75ef6-8381-4f9e-9765-5eeb3a734df0

## After


https://github.com/user-attachments/assets/b2b49894-2dc2-42ba-8038-504a1b4c2665


Release Notes:

- N/A

Co-authored-by: Conrad <conrad@zed.dev>

crates/editor/src/editor.rs

@@ -8620,7 +8620,7 @@ impl Editor {
                     .snapshot(window, cx)
                     .display_snapshot
                     .buffer_snapshot
-                    .anchor_before(Point::new(cursor_position.row, 0));
+                    .anchor_after(Point::new(cursor_position.row, 0));
 
                 (
                     breakpoint_position,
@@ -8687,7 +8687,7 @@ impl Editor {
                 .snapshot(window, cx)
                 .display_snapshot
                 .buffer_snapshot
-                .anchor_before(Point::new(cursor_position.row, 0));
+                .anchor_after(Point::new(cursor_position.row, 0));
 
             self.edit_breakpoint_at_anchor(
                 breakpoint_position,

crates/editor/src/element.rs

@@ -6858,7 +6858,7 @@ impl Element for EditorElement {
                                 .or_insert_with(|| {
                                     let position = snapshot.display_point_to_anchor(
                                         gutter_breakpoint_point,
-                                        Bias::Left,
+                                        Bias::Right,
                                     );
                                     let breakpoint = Breakpoint::new_standard();