Bug fixes

• AWS > EKS > Node Group > Discovery no longer goes into error when its cluster has been deleted. The deleted cluster and its node groups are now removed from the CMDB.
• EKS CMDB and Discovery controls no longer create duplicate or incomplete resources during a mod upgrade.
• AWS > EKS > Node Group > Discovery and AWS > EKS > Node Group > CMDB now rely on real-time events instead of re-running every 24 hours.