related to https://issues.redhat.com/browse/ACM-8285

Parent https://issues.redhat.com/browse/ACM-6424

When ACM is installed on a cluster where STS is configured ( for example ROSA with STS enabled ), the OADP operator requires to set the role_arn

• on the OADP operator , at install time, if the cluster is using OCP 4.15 or later
• or by creating the cloud_credentials secret first and setting the role_arn, then installing OADP

https://docs.openshift.com/rosa/rosa_backing_up_and_restoring_applications/backing-up-applications.html

We need to add support for this STS option on the backup chart, if the cluster has STS enabled