Modified Network Connectivity Internal Range terraform config to support exclude CIDR ranges feature.

[dorianverna]

This PR aims to modify the Internal Range Terraform support as follows:

1. Add a new field available to the Internal Range resource called excludeCidrRanges.
2. Add a template file showing how the feature is used.
3. Added acceptance test for the newly added feature.

Note that:

• The feature is not fully rolled out in v1.

networkconnectivity: added `excludeCidrRanges` field to `google_network_connectivity_internal_range` resource