[FIX] product: product name overflow is hidden

Steps to reproduce:

1 - activate "Print GS1 Barcodes for Lots & Serial Numbers"
2 - create a product P tracked by lot
3 - print the "Lot/Serial Number (PDF)" from the stock.lot form/list
view

Bug:
contrary to previous versions, the current template doesn't allow the
field to overflow into multiple lines

Fix:
change the css class `o_label_4x12` as it is only used in usecases
where overflow show be allowed

OPW-3336476

closes odoo/odoo#124557

X-original-commit: a5924bfe11cd9324e2ba056e0ac1d449aed730c8
Signed-off-by: William Henrotin (whe) <whe@odoo.com>
Signed-off-by: Mohamed Megahed Abbas Megahed SALLAM (mome) <mome@odoo.com>

addons/product/static/src/scss/report_label_sheet.scss

@@ -72,8 +72,8 @@
         padding:0;
         line-height:1;
         font-size:55%;
-        overflow:hidden;
-        white-space:nowrap;
-        text-overflow: ellipsis;
+        overflow:visible;
+        white-space:normal;
+        word-wrap: break-word;
     }
 }