Merge the two ViewRowsSource plugins

Problem/Motivation

We have both ui_patterns_views/ViewRowsSource and display_builder_views/ViewRowsSource.

Proposed resolution

There must be a reason why this plugin was duplicated, let's see if we have something to change in
ui_patterns_views/ViewRowsSource

Can we get rid of context_requirements: ['is_display_builder_views'] which is not existing in UI Patterns 2? Maybe we need to merge this context requirement with views:style from ui_patterns_views/ViewRowsSource (which may be renamed, views:view? views:rows? views:display? but it is an UI Patterns 2 issue).

Remaining tasks

Do we move the source plugins of display_builder_views to display_builder_views once we are sure they are compatible? If we do that, let's be careful with ✨ Expose view sources forms in SourceInterface::settingsForm() Active .