Move google cloud runner config to register view

What does this MR do and why?

It's been decided to move the google cloud runner configuration steps to the runner register view instead of the create runner view. This MR removes the old work and implements the new UX flow. So this MR doesn't get too big, two more MRs will be opened to implement the functionality for listing permissions and fetching registering scripts.

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

Step 1: Create runner with google cloud platform option

Step 2: Register runner (google cloud)

How to set up and validate locally

1. Enable flag

   :google_cloud_runner_provisioning

2. Visit project and group runner creation views (should not be available on admin)

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

Related to #443230 (closed)