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]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!