DEV: Log deprecated FA 4.7 icon names in /logs (take 2)

Does not use utilities library, to avoid wizard qunit test failures

app/assets/javascripts/discourse-common/lib/icon-library.js.es6

@@ -584,6 +584,18 @@ function warnIfDeprecated(oldId, newId) {
   deprecated(
     `Please replace all occurrences of "${oldId}"" with "${newId}". FontAwesome 4.7 icon names are now deprecated and will be removed in the next release.`
   );
+  if (!Discourse.testing) {
+    const errorData = {
+      message: `FA icon deprecation: replace "${oldId}"" with "${newId}".`,
+      stacktrace: Error().stack
+    };
+
+    Ember.$.ajax(`${Discourse.BaseUri}/logs/report_js_error`, {
+      errorData,
+      type: "POST",
+      cache: false
+    });
+  }
 }
 
 function handleIconId(icon) {