fix addSuperAdminUser migration issue

Author: Thomasr

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/repository/UserRepository.java

@@ -21,5 +21,5 @@ public interface UserRepository extends ReactiveMongoRepository<User, String> {
     Mono<User> findByName(String rawUuid);
 
     //email1 and email2 should be equal
-    Mono<User> findByEmailOrConnections_Email(String email1, String email2);
+    Flux<User> findByEmailOrConnections_Email(String email1, String email2);
 }

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/user/service/UserServiceImpl.java

@@ -113,7 +113,7 @@ public Mono<User> findByName(String rawUuid) {
     }
 
     public Mono<User> findByEmailDeep(String email) {
-        return repository.findByEmailOrConnections_Email(email, email);
+        return repository.findByEmailOrConnections_Email(email, email).next();
     }
 
     @Override

server/api-service/lowcoder-server/src/main/java/org/lowcoder/runner/migrations/job/AddSuperAdminUserImpl.java

@@ -45,6 +45,7 @@ private AuthUser formulateAuthUser() {
         return AuthUser.builder()
                 .uid(username)
                 .username(username)
+                .email(username)
                 .authContext(authRequestContext)
                 .build();
     }