[FIX] website_form: cancel records creation if error

When running an automated action on record creation, if the action
raises a UserError/ValidationError, the record will still be created.

To reproduce the error:
(Need website_crm,base_automation. Enable debug mode)
1. Create an Automated Action
    - Model: Lead/Opportunity
    - Trigger: On Creation & Update
    - Trigger Fields: Phone (crm.lead)
    - Action To Do: Execute Python Code
    - Python Code:
    ```python
    if record.phone:
        raise UserError("Lorem ipsum")
    ```
2. On website, add a website form WF
    - Action: "Create an Opportunity"
3. Complete and submit WF including a phone number

Error: An error message is displayed ("Lorem ispum"). However, the lead
has been created and is present in CRM Pipeline.

An on-creation automated action is executed once the record is executed,
but nothing will cancel this records creation if the action raises a
UserError/ValidationError.

OPW-2423948

closes odoo/odoo#69477

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

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