First MVC Visualization Designer

What does this MR do and why?

First version of the visualization designer allowing to select Measures and Dimensions, at the moment produces Code as result.

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 #384463 (closed), #384462 (closed)