templates/testing: Increase timeout for selenium session

I think it's causing issues with test_compose_clone so I want to try
increasing the timeout.

deploy/iqe-trigger-integration.yml

@@ -106,6 +106,8 @@ objects:
               value: ${SELENIUM_JAVA_OPTS}
             - name: VNC_GEOMETRY
               value: ${VNC_GEOMETRY}
+            - name: SE_NODE_SESSION_TIMEOUT
+              value: ${SE_NODE_SESSION_TIMEOUT}
           resources:
             limits:
               cpu: ${SELENIUM_CPU_LIMIT}
@@ -177,3 +179,5 @@ parameters:
   value: '1920x1080'
 - name: IQE_PARALLEL_ENABLED
   value: "false"
+- name: SE_NODE_SESSION_TIMEOUT
+  value: 600