Bug 10684: add regression test

Bug 10684: add regression test

This patch adds a regression test for Koha's ability
to gracefully handle records that Zebra will index but
which MARC::Record won't parse.  In particular, MARC::File::USMARC
croaks on records that contain non-alphanumeric characters in the
tag name.

To test:

[1] After applying this test, run prove -v t/db_dependent/Search.t
    The test script will die when it gets to the regression test.
[2] After applying the main patches that fix the bug, the test
    script should pass.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>