debugger: Fix prevent creating breakpoints inside breakpoint editor (#42475)

Closes #38057

This PR fixes that you can no longer create breakpoints inside the
breakpoint editor in code called `BreakpointPromptEditor`. As you can
see, inside the after video, there is no breakpoint editor created
anymore.

**Before**


https://github.com/user-attachments/assets/c4e02684-ac40-4176-bd19-f8f08e831dde

**After**


https://github.com/user-attachments/assets/f5b1176f-9545-4629-be12-05c64697a3de

Release Notes:

- Debugger: Prevent breakpoints from being created inside the breakpoint
editor

crates/editor/src/editor.rs

@@ -11060,6 +11060,10 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        if self.breakpoint_store.is_none() {
+            return;
+        }
+
         for (anchor, breakpoint) in self.breakpoints_at_cursors(window, cx) {
             let breakpoint = breakpoint.unwrap_or_else(|| Breakpoint {
                 message: None,
@@ -11119,6 +11123,10 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        if self.breakpoint_store.is_none() {
+            return;
+        }
+
         for (anchor, breakpoint) in self.breakpoints_at_cursors(window, cx) {
             let Some(breakpoint) = breakpoint.filter(|breakpoint| breakpoint.is_disabled()) else {
                 continue;
@@ -11138,6 +11146,10 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        if self.breakpoint_store.is_none() {
+            return;
+        }
+
         for (anchor, breakpoint) in self.breakpoints_at_cursors(window, cx) {
             let Some(breakpoint) = breakpoint.filter(|breakpoint| breakpoint.is_enabled()) else {
                 continue;
@@ -11157,6 +11169,10 @@ impl Editor {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) {
+        if self.breakpoint_store.is_none() {
+            return;
+        }
+
         for (anchor, breakpoint) in self.breakpoints_at_cursors(window, cx) {
             if let Some(breakpoint) = breakpoint {
                 self.edit_breakpoint_at_anchor(