fix: custom userID not being added when specified in zitadel.org.v2.AddOrganizationRequest.AddOrganization() request (#9334)

# Which Problems Are Solved

When specifying a `user_id` as a human admin in
`zitadel.org.v2.AddOrganizationRequest.AddOrganization()` the `user_id`
specified in the request should have been used, before it was being
ignored, this has been fixed with this PR

# Additional Context
- Closes https://github.com/zitadel/zitadel/issues/9308

---------

Co-authored-by: Iraq Jaber <IraqJaber@gmail.com>

internal/api/grpc/org/v2/integration_test/org_test.go

@@ -43,6 +43,7 @@ func TestMain(m *testing.M) {
 
 func TestServer_AddOrganization(t *testing.T) {
 	idpResp := Instance.AddGenericOAuthProvider(CTX, Instance.DefaultOrg.Id)
+	userId := "userID"
 
 	tests := []struct {
 		name    string
@@ -81,7 +82,7 @@ func TestServer_AddOrganization(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name: "admin with init",
+			name: "admin with init with userID passed for Human admin",
 			ctx:  CTX,
 			req: &org.AddOrganizationRequest{
 				Name: gofakeit.AppName(),
@@ -89,6 +90,7 @@ func TestServer_AddOrganization(t *testing.T) {
 					{
 						UserType: &org.AddOrganizationRequest_Admin_Human{
 							Human: &user.AddHumanUserRequest{
+								UserId: &userId,
 								Profile: &user.SetHumanProfile{
 									GivenName:  "firstname",
 									FamilyName: "lastname",
@@ -108,7 +110,7 @@ func TestServer_AddOrganization(t *testing.T) {
 				OrganizationId: integration.NotEmpty,
 				CreatedAdmins: []*org.AddOrganizationResponse_CreatedAdmin{
 					{
-						UserId:    integration.NotEmpty,
+						UserId:    userId,
 						EmailCode: gu.Ptr(integration.NotEmpty),
 						PhoneCode: nil,
 					},
@@ -140,7 +142,7 @@ func TestServer_AddOrganization(t *testing.T) {
 								IdpLinks: []*user.IDPLink{
 									{
 										IdpId:    idpResp.Id,
-										UserId:   "userID",
+										UserId:   userId,
 										UserName: "username",
 									},
 								},

internal/api/grpc/org/v2/org.go

@@ -57,6 +57,7 @@ func addOrganizationRequestAdminToCommand(admin *org.AddOrganizationRequest_Admi
 		if err != nil {
 			return nil, err
 		}
+
 		return &command.OrgSetupAdmin{
 			Human: human,
 			Roles: admin.GetRoles(),