Update workspace web ide image to use workspace base image

Issue - Build workspace base image and use it as base f... (gitlab#524214 - closed)

What does this MR do and why?

After we publish the workspace base image, now we switch web ide workspace image to use the latest base image published.

Checklist

• (If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.