Add more options to Auto DevOps configuration UI

Description

When enabling Auto DevOps, you can add a base domain. We should also let you pick a deployment strategy, enable additional services, etc.

Proposal

Links / references

• Expands on https://gitlab.com/gitlab-org/gitlab-ce/issues/37290
• Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/38542

Documentation blurb

Overview

What is it? Why should someone use this feature? What is the underlying (business) problem? How do you use this feature?

Use cases

Who is this for? Provide one or more use cases.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.

• Feature assurance
• Documentation
• Added to features.yml