Ensure private google access is enabled for Google Compute Subnetwork

Private Google Access can be enabled for virtual machines in Google Compute so that they can be accessed from a VPC network. For more information on Google Compute private access options, see the GCP documentation.
References:
https://cloud.google.com/vpc/docs/configure-private-google-access

In GCP Console -

1. Open the VPC networks page.
2. Select the name of the network that contains the subnet to edit.
3. Click the name of the subnet, select details, then click Edit.
4. Select the Enable network policy for master and Enable network policy for nodes checkbox (One at a time).
5. In the Private Google Access section, select On.
6. Click Save.

In Terraform -

1. In the google_compute_subnetwork resource, ensure that private_ip_google_access attribute is not set to false.

References:
https://cloud.google.com/vpc/docs/configure-private-google-access
https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_subnetwork#private_ip_google_access