fix: case changes on org domain (#9196)

# Which Problems Are Solved

Organization name change results in domain events even if the domain
itself doesn't change.

# How the Problems Are Solved

Check if the domain itself really changes, and if not, don't create the
events.

# Additional Changes

Unittest for this specific case.

# Additional Context

None

(cherry picked from commit 69372e5209)

internal/command/org_domain.go

@@ -334,6 +334,10 @@ func (c *Commands) changeDefaultDomain(ctx context.Context, orgID, newName strin
 				if err != nil {
 					return nil, err
 				}
+				// rename of organization resulting in no change in the domain
+				if newDefaultDomain == defaultDomain {
+					return nil, nil
+				}
 				events := []eventstore.Command{
 					org.NewDomainAddedEvent(ctx, orgAgg, newDefaultDomain),
 					org.NewDomainVerifiedEvent(ctx, orgAgg, newDefaultDomain),