Reference field in instance form fail for different cases

When the ui patterns component form is used by display builder, the Remove button introduces some problems because of the drupal core FormBuilder.
Drupal core is trying to automatically identify a triggering element, and in some cases the Remove button of a slot is identified as triggering element and its submit callback is used. Awful edge case.

Let's note also the remove button was not working... fixed in 📌 [2.0.9] Component form : update behavior of remove slot source button Active

In this issue i also fix missing injected contexts in the builder panel.

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