Bug 26963: Don't call 'can_be_transferred' for each possible library for each item

Bug 26963: Don't call 'can_be_transferred' for each possible library for each item

Currently When calling Koha::Template::Plugin::Branches::pickup_locations
we call pickup_location for each item of the bib, and for each item we get a list of possible
branches, we then check those branches against the transfer limits, this is inefficent

Given a system with 100 branches, and each branch having an item attached to one bib (100 items)
we will call can_be_transferred ~10000 times - and that will happen for each hold placed on the bib

For me this patch reduced load time from 77 seconds to 18 seconds

To test:
1 - Find a bib
2 - Place 4 title level holds
3 - Add some branches and items for this bib to your system:
  INSERT INTO branches (branchcode,branchname,pickup_location) SELECT CONCAT(branchcode,"D"),CONCAT(branchname,"A"),pickup_location FROM branches;
  INSERT INTO branches (branchcode,branchname,pickup_location) SELECT CONCAT(branchcode,"D"),CONCAT(branchname,"B"),pickup_location FROM branches;
  INSERT INTO branches (branchcode,branchname,pickup_location) SELECT CONCAT(branchcode,"D"),CONCAT(branchname,"C"),pickup_location FROM branches;
  INSERT INTO branches (branchcode,branchname,pickup_location) SELECT CONCAT(branchcode,"D"),CONCAT(branchname,"D"),pickup_location FROM branches;
  INSERT INTO items (biblionumber,biblioitemnumber,barcode,itype,homebranch,holdingbranch) SELECT 1,1,CONCAT("test-",branchcode),'BKS',branchcode,branchcode FROM branches;
4 - Set systempreferences:
    UseBranchTransferLimits = 'enforce'
     BranchTransferLimitsType = 'item type'
5 - Find the bib and click the holds tab
6 - Wait for a long time, it shoudl eventually load
7 - Apply patch and restart al the things
8 - Load the page again, it should be much faster

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Bob Bennhoff <bbennhoff@clicweb.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>