[FIX] hr_work_entry_contract: Disable tracking on work entries generation

Purpose
=======

Writing on untracked fields like date_generated_from will fetch allt he fields
values, including non stored ones (like wage_with_holidays, which is heavy).

X-original-commit: 5145e0782b4e3246ab84e81f4a7b450d7f463efe

addons/hr_work_entry_contract/models/hr_contract.py

@@ -179,6 +179,7 @@ class HrContract(models.Model):
         return contract_vals
 
     def _generate_work_entries(self, date_start, date_stop, force=False):
+        self = self.with_context(tracking_disable=True)
         canceled_contracts = self.filtered(lambda c: c.state == 'cancel')
         if canceled_contracts:
             raise UserError(