glcoud based authentication for ansible

##### SUMMARY
this collection should work using one's environment when one has authenticated using gcloud, as the following documentation states (for terraform):

https://cloud.google.com/docs/terraform/authentication#local_dev_environment

This, actually, works with Terraform/OpenTofu.

It doesn't work with Ansible.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
google_service_account or google_auth

##### ADDITIONAL INFORMATION

```yaml
plugin: google.cloud.gcp_compute
projects: xpc-25
hostnames:
- name
```

```bash
ansible -i hosts.gcp.yaml -m ansible.builtin.ping all
```

That should just work if `gcloud auth application-default login` was done beforehand.

Start by reproducing the issue with the google.cloud.gcp_compute inventory plugin and the provided Ansible ping command after running gcloud auth application-default login. Trace authentication through the google_service_account or google_auth components. Done means the inventory and ping command work using the local Google Cloud application-default credentials without additional configuration.

Written by the indexing model from the issue text.