Rain Admin 2.x - Use Edit All / Collapse All from paragraphs browser widget

Problem/Motivation

Rain Admin Theme version 2.x does not currently show the Edit All / Collapse All buttons that come from paragraphs browser widget, when Collapse / Edit all widget feature is enabled in the entity form display settings.

Add support for showing these paragraph action buttons in the Rain Admin theme.

Steps to reproduce

• Install rain_admin theme version 2.x, set as default admin theme
• Install and enable paragraphs_browser module
• Create a paragraph type
• Add entity reference revision field to paragraphs on a content type like Basic page or Article
• Select the paragraph type to be included
• In the entity form display settings, update field to use paragraph browser experimental
• Enable Collapse / Edit all widget feature
• Add new content and add multiple paragraphs
• Collapse / Edit all buttons do not appear like they would in Seven or Thunder Admin themes

Proposed resolution

Update styling to support the Collapse / Edit all buttons.