Dev init lets you init runtime and AC images that don't exist

[kushalmalani]

Describe the bug

1. Issue on the converged CLI
2. User should only be able init a project with a runtime or AC image the exists

Please paste terminal or playground output in a code block here

What CLI Version did you experience this bug?

What Operating System is the above CLI installed on?

🪜 Steps To Reproduce

📸 Screenshots

Original Ticket - https://github.com/astronomer/cloud-cli/issues/230

[BasPH]

+1 on this. No input validation is performed so you can run e.g. astro dev init -v foobar and initialize a project with a non-existent tag.