Bug 15160: GetTopIssues.t should create random data

Bug 15160: GetTopIssues.t should create random data

This patch refactors t/db_dependent/Circulation/GetTopIssues.t so it
creates its own data with random values. It does so by replacing (legacy)
SQL inserts and fixed value data inserting by TestBuilder generated data.

There is no expected behaviour change.

To test:
- Create an itemtyp directly on your DB with GTI_I_TEST as its itemtype
  > INSERT INTO itemtypes (itemtype) VALUES ('GTI_I_TEST');
- Run:
  $ prove t/db_dependent/Circulation/GetTopIssues.t
=> FAIL: The insert line fails
- Apply the patch
- Run:
  $ prove t/db_dependent/Circulation/GetTopIssues.t
=> SUCCESS: tests pass due to random data usage.
- Sign off

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
  Test plan produces the expected result, failing, then OK.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>