fix(js): Do not capture RouteError TypeError (#50202)

This is a follow up from https://github.com/getsentry/sentry/pull/16327

We explicitly captured this here
https://github.com/getsentry/sentry/pull/16327#discussion_r364386102,
but the actual error we're capturing is ostensible in-actionable.

Fixes: JAVASCRIPT-2MFW

static/app/views/routeError.tsx

@@ -61,7 +61,7 @@ function RouteError({error, disableLogSentry, disableReport, project}: Props) {
       } catch (e) {
         Sentry.withScope(scope => {
           enrichScopeContext(scope);
-          Sentry.captureException(e);
+          scope.setExtra('cannotSetMessage', true);
         });
       }
     }