[CORL-845] Account Linking (#2818)

* feat: added new linking backend

* feat: added duplicateEmail to hash

* fix: stored the duplicate email on the user

* feat: initial implmentation of account linking in auth

* test: fix unit tests

* fix+test: translations and tests added

* chore+test: rename view to LINK_ACCOUNT + more tests

* feat+test: account linking admin + more tests

* feat: Handle incomplete accounts

* chore: add some comments

* feat: expose duplicateEmail through graphql and impl for stream

* feat: admin to use duplicateEmail from graphql

* fix: no need to validate password for account linking

* fix: dont validate password

* fix: no need to render error message when account was incomplete

* chore: log to console when encountering incomplete account

* chore: adjust comment

* chore: simplify + add comments

* chore: wording

* chore: comments

Co-authored-by: Vinh <vinh@vinh.tech>
Co-authored-by: Kim Gardner <kgardnr@gmail.com>

src/core/server/graph/schema/schema.graphql

@@ -1944,6 +1944,13 @@ type User {
       permit: [MISSING_NAME, MISSING_EMAIL, SUSPENDED, BANNED, PENDING_DELETION]
     )
 
+  """
+  duplicateEmail is set on users that have a matching email with another user in
+  the database. Only relevant during the account completion process.
+  """
+  duplicateEmail: String
+    @auth(userIDField: "id", permit: [MISSING_NAME, MISSING_EMAIL])
+
   """
   emailVerified when true indicates that the given email address has been
   verified.
@@ -1972,7 +1979,7 @@ type User {
     @auth(
       roles: [ADMIN, MODERATOR]
       userIDField: "id"
-      permit: [SUSPENDED, BANNED, PENDING_DELETION]
+      permit: [MISSING_NAME, MISSING_EMAIL, SUSPENDED, BANNED, PENDING_DELETION]
     )
 
   """