Bug 35033: Add a validation for biblioitems in about/system information

Bug 35033: Add a validation for biblioitems in about/system information

In the About section, under the System information tab, we get validation between
issues, borrowers, biblio, items, reserves tables, and their deleted/old counterpart.

But there's no validation for biblioitems.

This patch will simply add the same test (and display) as the others, but for biblioitems.

Testing
0) Create a simple biblio entry through cataloguing. Note the biblioitemnumber created.
1) Insert a dummy entry in deletedbiblioitem using the biblioitemnumber.  An simple SQL will do
insert into deletedbiblioitems select * from biblioitems where biblioitemnumber = GIVENbin;
2) Go to about, see there's no warning in systeminformation.
3) apply the patch, validate that an error appears.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 07ac0b1f72245de6e8ecf2a1a9d2e485ca233f79)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 4579a814bc9b24dfe10f392bad6dd201ef465435)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>