Create project: Add deployment target select

What does this MR do and why?

Add deployment target select to the project creation shared fields component.

Important

These changes are behind the new_project_creation_form feature flag. They won't be available to users until all the work is done. See the plan here #514700 (closed)

References

FF plan: #514700 (closed)

UX Paper Cuts palanning issue: #512695 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. In rails console enable the experiment fully

   Feature.enable(:new_project_creation_form)

2. Go to http://gdk.test:3000/projects/new
3. Choose a blank project
4. Click [Next step]

MR acceptance checklist

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