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/integration/assert.go

@@ -19,6 +19,7 @@ import (
 type Details interface {
 	comparable
 	GetSequence() uint64
+	GetCreationDate() *timestamppb.Timestamp
 	GetChangeDate() *timestamppb.Timestamp
 	GetResourceOwner() string
 }
@@ -62,6 +63,12 @@ func AssertDetails[D Details, M DetailsMsg[D]](t assert.TestingT, expected, actu
 
 	assert.NotZero(t, gotDetails.GetSequence())
 
+	if wantDetails.GetCreationDate() != nil {
+		wantCreationDate := time.Now()
+		gotCreationDate := gotDetails.GetCreationDate().AsTime()
+		assert.WithinRange(t, gotCreationDate, wantCreationDate.Add(-time.Minute), wantCreationDate.Add(time.Minute))
+	}
+
 	if wantDetails.GetChangeDate() != nil {
 		wantChangeDate := time.Now()
 		gotChangeDate := gotDetails.GetChangeDate().AsTime()