Adding GCP image sharing option according to the discussion on slack(https://redhat-internal.slack.com/archives/C03AZ0264LW/p1692789579814619) and mocks(https://issues.redhat.com/browse/HMS-2352).
In summary, within our GCP sources, we store the project ID. Images cannot be shared directly with a project ID, but they can be shared with a service account or a Google account. Consequently, to launch instances in GCP, users are not required to provide their Google account; instead, the images should be shared with the provisioning service account. This ensures that the provisioning team has access to the necessary images, as sharing them with individual users would not allow that.
After a thorough discussion, we have collectively decided to introduce an option. This option allows users to exclusively utilize the Launch service without the need to share the image with a Google account.
a890dc5666