fix: ps - remove required for executionPhase and flowPhase

As it's more either/or that's requiredAs it's more either/or that's requiredAs it's more either/or that's requiredAs it's more either/or that's requiredAs it's more either/or that's required As it's more either/or that's required

projects/ui-policy-studio-angular/src/lib/policy-group-studio/gio-policy-group-studio.component.ts

@@ -84,15 +84,15 @@ export class GioPolicyGroupStudioComponent implements OnChanges {
    * Execution phase targeted by the Policy Group Studio
    * @deprecated Use `flowPhase` instead. To keep as long as we support APIM < 4.6
    */
-  @Input({ required: true })
+  @Input()
   public set executionPhase(value: ExecutionPhase) {
     this.flowPhase = fromExecutionPhase(value);
   }
 
   /**
    * Execution phase targeted by the Policy Group Studio
    */
-  @Input({ required: true })
+  @Input()
   public flowPhase!: FlowPhase;
 
   /**