EPMRPP-114079 || add SAML authentication flow to AuthFlowEnum (#2641)

Author: grabsefx

src/main/java/com/epam/reportportal/base/model/integration/AuthFlowEnum.java

@@ -24,5 +24,6 @@ public enum AuthFlowEnum {
   BASIC,
   TOKEN,
   FORM,
-  LDAP
+  LDAP,
+  SAML
 }