Display link to database integration docs when connecting a new database (#16018)

* Add basic AddDatabaseHelpCard component

* Display database engine on HelpCard

* Display help link for cloud instances

* Display link to database setup docs

* Dispaly help card at `/admin/database/create`

* Test help card changes copy on new db page

* Display db setup help card on Setup

* Display help card only when db engine is selected

* Fix not translated string

* Use styled-components for AddDatabaseHelpCard