Use correct Project ID regex in instanceGroupManagerURL

[beaglebot]

Attempting to create a GKE cluster with a (valid) project ID containing a ':' results in the following error:

Error reading instance group manage URL '"https://www.googleapis.com/compute/v1/projects/example.io:example/zones/us-central1-a/instanceGroupManagers/gke-example-product-terraform-201804-4f57f12f-grp"'

This error is raised here, and caused by an overly restrictive project regex here.

The correct project ID regex is already defined in the repo here.

This PR updates the instanceGroupManagerURL regex to use the existing ProjectRegex.

[rosbo]

Thanks @beaglebot for this contribution. Merging

[ghost]

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