[FIX] stock: no formatting while printing traceability report for the first time

While generating the traceability report for the first time,
if the assets are not in cache, the report will be having simple markup with
no styles applied. To workaround this issue, we manually commit the writes
in the `ir.attachment` table. It is done thanks to a key in the context.

Task-1974338

addons/stock/models/stock_traceability.py

@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo import api, models, _
+from odoo.tools import config
 
 
 rec = 0
@@ -206,7 +207,11 @@ class MrpStockReport(models.TransientModel):
             'base_url': base_url,
         }
 
-        body = self.env['ir.ui.view'].render_template(
+        context = dict(self.env.context)
+        if not config['test_enable']:
+            context['commit_assetsbundle'] = True
+
+        body = self.env['ir.ui.view'].with_context(context).render_template(
             "stock.report_stock_inventory_print",
             values=dict(rcontext, lines=lines, report=self, context=self),
         )