[IMP] srpeadsheet: make xlsx import verbose in debug mode

Make the xlsx import display warning for things that couldn't be imported,
but only if Odoo is in debug mode.

Odoo task 3035674

closes odoo/odoo#103671

Signed-off-by: Rémi Rahir (rar) <rar@odoo.com>

addons/spreadsheet/static/src/o_spreadsheet/migration.js

@@ -18,7 +18,7 @@ const MAP = {
 const dmyRegex = /^([0|1|2|3][1-9])\/(0[1-9]|1[0-2])\/(\d{4})$/i;
 
 export function migrate(data) {
-    let _data = load(data);
+    let _data = load(data, !!odoo.debug);
     const version = _data.odooVersion || 0;
     if (version < 1) {
         _data = migrate0to1(_data);