OBPIH-4440 Add item search to PO view page

[kchelstowski]

After many different approaches, the dynamic filtering (hiding a row) worked the best here. I managed to recreate what was done probably in Stock History section. At the moment the filtering is done by product name which Kelsey admitted on one of the previous standups. The changes may seem weird (it might look like I changed the whole file) on Git, due to indents because of one additional

for everything, but the part I edited was just adding the <script> section and one if at the beginning of the first div.
The "if" was added to determine whether it is a putaway order or a PO order, because I assume it was not supposed to be done for putaways and as there is one view for both cases, it would work also for putaways if I hadn't added the "if".