fix(iam): adding addPrincipalsToAssumedBy() to allow adding moreprincipals to TrustRelationship of Role to overcome limitation of grantAssumeRole() (#22550)

fix(iam): adding addPrincipalsToAssumedBy() to allow adding moreprincipals to TrustRelationship of Role to overcome limitation of grantAssumeRole() (#22550) #459