Notice that we allow at-most one appeal

Author: jonasfj

app/lib/frontend/templates/report.dart

@@ -208,6 +208,9 @@ Iterable<d.Node> _appeal(
           '(source repositories, screenshots, logs, bug tracker entries, etc) '
           'consider uploading these and sharing a link.',
     ),
+    d.p(
+      child: d.b(text: 'You only have one appeal per incident.'),
+    ),
     if (!(sessionData?.isAuthenticated ?? false))
       d.fragment([
         d.p(text: 'Contact information:'),

app/test/frontend/golden/report_page_appeal.html

@@ -119,6 +119,9 @@ <h1>Appeal a resolution</h1>
             , please explain why the resolution should be reconsidered.
           </p>
           <p>If you have additional relevant documentation (source repositories, screenshots, logs, bug tracker entries, etc) consider uploading these and sharing a link.</p>
+          <p>
+            <b>You only have one appeal per incident.</b>
+          </p>
           <p>Contact information:</p>
           <div class="mdc-form-field">
             <label for="report-email">Email</label>