fix(ui): excessive toasts when generating on canvas

- Add `withToast` flag to `uploadImage` util
- Skip the toast if this is not set
- Use the flag to disable toasts when canvas does internal image-uploading stuff that should be invisible to user

invokeai/frontend/web/src/features/controlLayers/konva/CanvasCompositorModule.ts

@@ -302,6 +302,7 @@ export class CanvasCompositorModule extends CanvasModuleBase {
         is_intermediate: uploadOptions.is_intermediate,
         board_id: uploadOptions.is_intermediate ? undefined : selectAutoAddBoardId(this.manager.store.getState()),
         metadata: uploadOptions.metadata,
+        withToast: false,
       })
     );
     this.$isUploading.set(false);

invokeai/frontend/web/src/features/controlLayers/konva/CanvasEntity/CanvasEntityObjectRenderer.ts

@@ -493,6 +493,7 @@ export class CanvasEntityObjectRenderer extends CanvasModuleBase {
       file: new File([blob], `${this.id}_rasterized.png`, { type: 'image/png' }),
       image_category: 'other',
       is_intermediate: true,
+      withToast: false,
     });
     const imageObject = imageDTOToImageObject(imageDTO);
     if (replaceObjects) {