NOTE: Must be done first: T377186: [STORY] New widget to search and favourite templates
User Story:
As a user I want to be able to see all of my favourited templates, so that I can reuse them quickly.
Acceptance criteria:
- A list of all of a user's current favourite templates is shown below the template search form
- They're shown in alphabetical order
- Selecting a template is the same as selecting a search result, and takes the user to the template parameter form
- Templates are shown in the same way as in the search results (title and description)
- Template list has a scrollbar when long enough
- List is updated when a new favourite is added
Details for QA:
- Empty list is handled appropriately
- All favourite templates are shown