Add generic class to TR element that wraps paragraph bundles on node forms

This, actually, fixes even more important issue - Drupal 10 comes with CKEditor 5, which does not use `iframe`, so all styles leak from admin theme into CKEditor. In cases where editor is in paragraph edit form, we get table paddings from `.js .field--widget-paragraphs td`. So we must add that `paragraph-paragraph` class not only added, but used as well.

Went with little different class name - `paragraphs-paragraph`.