Entity delete form should highlight dependent entity deletions

Problem/Motivation

We recently had an issue where a site builder deleted a node view_mode and didn't realize that the dependent view would also be deleted.

Admittedly, this information is displayed in the current confirm form UI. However, in my opinion this form doesn't adequately represent the side effect of dependent configurations being deleted.

Proposed resolution

1. The delete form submit button should be updated with the class .button--danger to better indicate that this is a destructive operation.
2. Further, a warning should be displayed whenever there is a side-effect of dependent configuration entities being deleted.