Parallelstore switch region and update network name

[Shuang-cnt]

switch region to us-east4 due to no enough resource and changing the network name in the test to avoid collision with hidden resource

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[cdunbar13]

Instead of changing the blueprint, you can update the test to use the new variables by doing something like

cli_deployment_vars:
  zone: "{{ zone }}"
  region: "{{ region }}"
  ...

The network change can be done by change vars.base_network_name the same way.