Increase LB test suite timeout on master branch to 360 minutes due to VM timeout observed regularly every few days

Author: kannanjgithub

tools/internal_ci/linux/grpc_xds_k8s_lb.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/psm-interop-test-cpp.sh"
-timeout_mins: 300
+timeout_mins: 360
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"

tools/internal_ci/linux/grpc_xds_k8s_lb_python.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/psm-interop-test-python.sh"
-timeout_mins: 300
+timeout_mins: 360
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"