Prerequisites to removing Facebook authentication (#13683)

* Don't sign in user when trying to connect a social account that was already created

* Log social users into matching local auth accounts

If the social account has an email that already exists as a local user, instead of creating a new account log them into their account and add the social auth to the account

* If possible set local authentication email for social users

* Allow password reset emails to be sent to social login users

* lint fixes

* Fix issues and tests

* fix tests

* Fix lint error.

website/server/controllers/api-v3/auth.js

@@ -341,7 +341,14 @@ api.resetPassword = {
     if (validationErrors) throw validationErrors;
 
     const email = req.body.email.toLowerCase();
-    const user = await User.findOne({ 'auth.local.email': email }).exec();
+    const user = await User.findOne({
+      $or: [
+        { 'auth.local.email': email },
+        { 'auth.apple.emails.value': email },
+        { 'auth.google.emails.value': email },
+        { 'auth.facebook.emails.value': email },
+      ],
+    }).exec();
 
     if (user) {
       // create an encrypted link to be used to reset the password