fix(user fields): missing creationDate in details (#9250)

# Which Problems Are Solved

The `creationDate` property on user search V2 endpoint was missing

# How the Problems Are Solved

Added property in v2 `object.proto` and in the function creating the
details on each call

# Additional Changes
- none
# Additional Context
closes #8552

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

internal/api/grpc/user/v2/integration_test/query_test.go

@@ -150,6 +150,7 @@ func TestServer_GetUserByID(t *testing.T) {
 				},
 				Details: &object.Details{
 					ChangeDate:    timestamppb.Now(),
+					CreationDate:  timestamppb.Now(),
 					ResourceOwner: orgResp.OrganizationId,
 				},
 			},
@@ -195,6 +196,7 @@ func TestServer_GetUserByID(t *testing.T) {
 				},
 				Details: &object.Details{
 					ChangeDate:    timestamppb.Now(),
+					CreationDate:  timestamppb.Now(),
 					ResourceOwner: orgResp.OrganizationId,
 				},
 			},
@@ -282,6 +284,7 @@ func TestServer_GetUserByID_Permission(t *testing.T) {
 				},
 				Details: &object.Details{
 					ChangeDate:    timestamppb.Now(),
+					CreationDate:  timestamppb.Now(),
 					ResourceOwner: newOrg.GetOrganizationId(),
 				},
 			},
@@ -320,6 +323,7 @@ func TestServer_GetUserByID_Permission(t *testing.T) {
 				},
 				Details: &object.Details{
 					ChangeDate:    timestamppb.Now(),
+					CreationDate:  timestamppb.Now(),
 					ResourceOwner: newOrg.GetOrganizationId(),
 				},
 			},
@@ -415,6 +419,8 @@ func createUser(ctx context.Context, orgID string, passwordChangeRequired bool)
 	phone := "+41" + gofakeit.Phone()
 	resp := Instance.CreateHumanUserVerified(ctx, orgID, username, phone)
 	info := userAttr{resp.GetUserId(), username, phone, nil, resp.GetDetails()}
+	// as the change date of the creation is the creation date
+	resp.Details.CreationDate = resp.GetDetails().GetChangeDate()
 	if passwordChangeRequired {
 		details := Instance.SetUserPassword(ctx, resp.GetUserId(), integration.UserPassword, true)
 		info.Changed = details.GetChangeDate()