feat: Remove OIDC and SSO support

Existing SSO accounts have no local password, so the migration
deactivates them before dropping is_sso_user and the
identity_provider_user table.

server/api/controllers/users/update-email.js

@@ -134,11 +134,7 @@ module.exports = {
       throw Errors.USER_NOT_FOUND;
     }
 
-    if (
-      user.email === sails.config.custom.defaultAdminEmail ||
-      user.isSsoUser ||
-      sails.config.custom.demoMode
-    ) {
+    if (user.email === sails.config.custom.defaultAdminEmail || sails.config.custom.demoMode) {
       throw Errors.NOT_ENOUGH_RIGHTS;
     }