Bug 35746: add multiselect to report dropdowns

Bug 35746: add multiselect to report dropdowns

Rebased for changes to guided_reports_start.tt

This patch adds the ability to use multi select in report dropdowns.

It uses syntax similar to using a list and when using the :all option
WHERE i.homebranch in <<Select libraries|brnaches:in>>

Test plan:
1. Create an SQL report with with new syntax for multi select
    SELECT
    i.homebranch,
    count(*)
    FROM items i
    WHERE i.homebranch in <<Select libraries|branches:in>>
    GROUP BY i.homebranch
2. Save the report
3. Note that you get the error
    The authorized value category (branches:in) you selected does not exist.
4. Apply the patch and repeat steps 1 and 2
5. Note the report saves successfully
6. Run the report
7. Note the select dropdown is now a multiselect
8. Run the report with multiple selections
10. Click show SQL and note that multi select parameters get inserted into the query like:
     WHERE i.homebranch in ('CPL', 'FFL', 'FPL')
11. Test other types of queries with multiple multi selects and lists etc

Sponsored-by: CLAMS
Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>