feat: add 'group created instructions' as info message (#4916)

Before, it was shown by UI when the chat is empty, however, in case of
verified groups, this is never the case any longer as the 'e2ee now
guaranteed' is always added.

src/test_utils.rs

@@ -374,6 +374,10 @@ impl TestContext {
             }
         });
 
+        ctx.set_config(Config::SkipStartMessages, Some("1"))
+            .await
+            .unwrap();
+
         Self {
             ctx,
             dir,