Fix multivpc missing region

[wiktorn]

This helps avoid errors like:

Error: cannot determine self_link for subnetwork "***": Cannot determine region: set in this resource, or set provider-level 'region' or 'zone'.

When just use-ing the generated networks.

Submission Checklist

NOTE: Community submissions can take up to 2 weeks to be reviewed.

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cluster Toolkit Contribution guidelines #

[tpdownes]

/gcbrun

[tpdownes]

@wiktorn can you please rebase this off the current state of develop branch? It is missing f3efb5f which is necessary for test to pass

[wiktorn]

@tpdownes Done

[tpdownes]

/gcbrun