First version for editing Dashboards

What does this MR do and why?

First version for editing customizable dashboards, this will only add resizing, moving and showing the resulting code of the dashboard to the customizable dashboard component. This is an iteration MR from !104077 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. Make sure you are on GitLab Ultimate
2. You need to set up the Product Analytics DevKit if you haven't already done so. And follow the instructions on Connecting GDK to your devkit.
3. Access /-/product_analytics/dashboards/widget-designer on an product analytics activated project like [GDK_HOST]/gitlab-org/gitlab-shell/-/product_analytics/dashboards/widget-designer.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

closes #385702 (closed)