Remove Dangerfile for prettier

What does this MR do and why?

Remove Dangerfile for prettier

This Dangerfile dates back to when we gradually adopted prettier. Now our code base is fully prettier compliant and we have a separate static-analysis job for prettier and we run it part of lefthook. So this Danger job just adds noise to the already long danger output and potentially takes a long time.

Let's remove it, it outlived it's purpose.

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

N/A

How to set up and validate locally

N/A