[Validators] Add validator `ExtraChefAttributesValidator` to validate format of ExtraChefAttributes and notify the user about downsides of `in_place_update_on_fleet_enabled=False`#7071

gmarciani merged 1 commit intoaws:developaws/aws-parallelcluster:developfrom

gmarciani:wip/mgiacomo/3150/performance-disable-cfnhup-on-compute-nodes-1024-1gmarciani/aws-parallelcluster:wip/mgiacomo/3150/performance-disable-cfnhup-on-compute-nodes-1024-1Copy head branch name to clipboard