Feature: new "report a bug" modal (#13530)

* WIP: report a bug api/ui

* fix lint

* add USER_USERNAME

* extend sendTxn tests / checks + fix bug report email

* fix lint

* add more checks to sendTxn - fix bug-report variables

* fix lint / ci

* fix test: reset email config url

* fix test stub

* fix tests

* refactor the variables checks

* lint.

* move bug-report page as a modal

* send user_email to the email

* show true/false instead 1/0

* fix issues

* fix footer report bug email if not logged in

* fix styles/margins

* prefill user's email

* show facebook email if local email not existing

* bugReportSuccessModal.vue

* add BROWSER_UA to mail properties

* extract bugReportLogic to its own lib file for unit test

* test api validators

* fix lint

website/client/src/components/header/userDropdown.vue

@@ -143,6 +143,7 @@ import userIcon from '@/assets/svg/user.svg';
 import MenuDropdown from '../ui/customMenuDropdown';
 import MessageCount from './messageCount';
 import { EVENTS } from '@/libs/events';
+import { PAGES } from '@/libs/consts';
 
 export default {
   components: {
@@ -170,7 +171,7 @@ export default {
       if (this.$router.history.current.name === 'privateMessages') {
         this.$root.$emit(EVENTS.PM_REFRESH);
       } else {
-        this.$router.push('/private-messages');
+        this.$router.push(PAGES.PRIVATE_MESSAGES);
       }
     },
     showProfile (startingPage) {