fix: define base uri for login v2 feature as string to make it config… (#10533)

…urable

# Which Problems Are Solved

BaseURI defined in environment variables or configuration files was
ignored for Login v2 feature flag.

# How the Problems Are Solved

Define BaseURI as string so that the environment variables and
configuration files can be parsed into it.

# Additional Changes

None

# Additional Context

Closes #10405

internal/command/instance_features.go

@@ -57,11 +57,16 @@ func (c *Commands) SetInstanceFeatures(ctx context.Context, f *InstanceFeatures)
 	return pushedEventsToObjectDetails(events), nil
 }
 
-func prepareSetFeatures(instanceID string, f *InstanceFeatures) preparation.Validation {
+func prepareSetFeatures(instanceID string, f *InstanceSetupFeatures) preparation.Validation {
 	return func() (preparation.CreateCommands, error) {
+		features, err := f.ToInstanceFeatures()
+		if err != nil {
+			return nil, err
+		}
+
 		return func(ctx context.Context, _ preparation.FilterToQueryReducer) ([]eventstore.Command, error) {
 			wm := NewInstanceFeaturesWriteModel(instanceID)
-			return wm.setCommands(ctx, f), nil
+			return wm.setCommands(ctx, features), nil
 		}, nil
 	}
 }