[IMP] stock: improve the alert system

Remove the "manual" system alert and replace it by a date field, `delay_alert_date`.
This field is computed in the method `_delay_alert_check` when we write on the date of a stock move.
The method `_delay_alert_check` look to the next stock move and to the previous know to
check if they will be late or not.

If a stock move will be late because of one of the previous stock move, `delay_alert_date`
will contains the minimal date that the stock move should have. Otherwise, `delay_alert_date`
will be False.

Task #1970595

Co-authored-by: sle <sle@odoo.com>

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