inline assistant: Do not dismiss while generating when hitting enter (#32810)

Closes #32798

Release Notes:

- Fixed an issue where the inline assistant would be dismissed when
hitting enter while generating code

crates/agent/src/inline_prompt_editor.rs

@@ -403,9 +403,7 @@ impl<T: 'static> PromptEditor<T> {
             CodegenStatus::Idle => {
                 cx.emit(PromptEditorEvent::StartRequested);
             }
-            CodegenStatus::Pending => {
-                cx.emit(PromptEditorEvent::DismissRequested);
-            }
+            CodegenStatus::Pending => {}
             CodegenStatus::Done => {
                 if self.edited_since_done {
                     cx.emit(PromptEditorEvent::StartRequested);
@@ -831,7 +829,6 @@ pub enum PromptEditorEvent {
     StopRequested,
     ConfirmRequested { execute: bool },
     CancelRequested,
-    DismissRequested,
     Resized { height_in_lines: u8 },
 }