Add modal that contains the GCP terraform script

What does this MR do and why?

Adds the modal that contains the GCP terraform script for provisioning GCP runners

This is only available for the project scope

#443230 (closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

How to set up and validate locally

1. Enable the feature flag

    echo "Feature.enable(:google_cloud_runner_provisioning)" | rails c

2. Visit project creation views (should not be available on admin and groups for now)

3. Select google cloud radio option (for platform)

4. Create runner

5. New options should show for register view if you chose the google cloud platform option

6. Existing runner options should still show for other platform selections

7. Fill the form values with the following:

    "Google cloud project ID": "dev-gcp-s3c-integrati-9abafed1",
    "region": "us-central1",
    "zone": "us-central1-a",

8. Click the Show instructions button and you should be able to see the instructions