Why this change?
A system test which was testing our ability to add a form template to a
category was flaky. This turned out to be a client side bug where the
`FormTemplateChooser` dropdown may not display any dropdown options if
the ajax request to fetch the categories form template has not been
completed when the dropdown is opened.
What does this change do?
Make use of select-kit's `triggerSearch` function to fetch the records
which will properly rerender the dropdown options.
