Bug 32984: Add link to EDI invoice to "Invoice" column if there is one

Bug 32984: Add link to EDI invoice to "Invoice" column if there is one

Test Plan:
1) Find or create an item invoiced via an EDI INVOICE message
2) Ensure you have the edi_manage subpermission
3) View catalogue/detail.pl, not the invoice link in the invoice column
4) Apply this patch
5) Restart all the things!
6) Reload catalogue/detail.pl
7) Note the new "(EDI invoice)" link in the column for the item
8) Verify the link does not show if you do not have the edi_manage
   subpermission

Signed-off-by: Jeremy Evans <Jeremy.Evans@ukhsa.gov.uk>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>