This PR adds `fullTextSearch: 'exact'` to most dropdown
invocations meaning that if there is a search box for the
dropdown it will automatically do a fullTextSearch looking
for the provided fragment instead of starting at the beginning
We should consider changing other places that use
`fullTextSearch: true` to `'exact'` because these will be using a
fuzzy-textual search that doesn't necessarily return the
expected results.
Fix#14689
Signed-off-by: Andrew Thornton <art27@cantab.net>