Set the persistence of the delete board snackbar to false, so that it… (#7305)

Fixes b/467187819

"Currently, when you delete an Opal, a toast pops up confirming you've
deleted the Opal. Today, you have to click x to dismiss the toast.
Change this behavior so that the toast disappears after 5 seconds if it
hasn't already been dismissed by the user yet. So there will be 2
criteria for dismissing this "opal has been deleted toast": 1) either
user clicks x to dismiss or 2) toast has been displayed for 5 seconds."

Author: markovgeorgi

packages/visual-editor/src/runtime/board.ts

@@ -793,7 +793,7 @@ export class Board extends EventTarget {
         messages.end,
         BreadboardUI.Types.SnackType.INFORMATION,
         [],
-        true,
+        false,
         true
       )
     );