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/idp/v2/query.go

@@ -31,6 +31,7 @@ func idpToPb(idp *query.IDPTemplate) *idp_pb.IDP {
 				Sequence:      idp.Sequence,
 				EventDate:     idp.ChangeDate,
 				ResourceOwner: idp.ResourceOwner,
+				CreationDate:  idp.CreationDate,
 			}),
 		State:  idpStateToPb(idp.State),
 		Name:   idp.Name,