give python, c# and c++ xds tests longer timeout, now that we have more test cases

tools/internal_ci/linux/grpc_xds.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_xds.sh"
-timeout_mins: 120
+timeout_mins: 180
 env_vars {
   key: "BAZEL_SCRIPT"
   value: "tools/internal_ci/linux/grpc_xds_bazel_test_in_docker.sh"

tools/internal_ci/linux/grpc_xds_csharp.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_xds_csharp.sh"
-timeout_mins: 120
+timeout_mins: 180
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"

tools/internal_ci/linux/grpc_xds_python.cfg

@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/linux/grpc_xds.sh"
-timeout_mins: 120
+timeout_mins: 180
 env_vars {
   key: "BAZEL_SCRIPT"
   value: "tools/internal_ci/linux/grpc_xds_bazel_python_test_in_docker.sh"