fix(widgets): remove experimental widgets (#6400)

The widgets (and connectors) EXPERIMENTAL_dynamicWidgets, EXPERIMENTAL_configureRelatedItems are removed, and replaced with their non-experimental version.

If you want to keep using the experimental behaviour of configure related items, you can copy the files from here into your project and continue using them.

BREAKING CHANGE: experimental configure related items is replace with related products
BREAKING CHANGE: experimental dynamic widgets is replaced with dynamic widgets

Author: Haroenv