Bug 37727: Prevent CSV Formula injection via DataTables

Bug 37727: Prevent CSV Formula injection via DataTables

This change prevents CSV Formula injection on DataTables exports
by escaping formula with a single quote prefix as per OWASP recommendations.

Test plan:
0. Apply patch
1. Go to http://localhost:8081/cgi-bin/koha/members/memberentry.pl
?op=edit_form&destination=circ&borrowernumber=51
2. Add the following in a "Circulation note"
=SUM(1+1)
3. Go to http://localhost:8081/cgi-bin/koha/members/member.pl
?quicksearch=1&circsearch=1&searchmember=koha
4. Click "Export" and choose "Excel" and "CSV"
5. Open those downloaded files in Excel
6. Note that the =SUM(1+1) function is prefixed with a single quote,
and is not automatically executed

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Works as advertised. The problematic "cell" is exported as "'=SUM(1+1)".
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>
Signed-off-by: wainuiwitikapark <wainuiwitikapark@catalyst.net.nz>
(cherry picked from commit dcb5cc10512ebbc2887bf8a3a3ebbaacf8fec553)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>