This update adjusts how project task filters are optimized behind the scenes. It helps keep searches and filtering reliable and efficient as the underlying Odoo system evolves, without changing day-to-day workflows for users.

Adapt usages of `Domain._optimize`.

task-3864512
odoo/odoo#190922

The sales order preview in the customer portal now hides the taxes column when AvaTax is active. This avoids showing tax details that are calculated through AvaTax, making portal previews clearer and less confusing for customers.

Adding a visibility condition for Avatax not being enabled to the taxes column in portal view of sales orders.

task: 4423974

This update keeps the rental sales app aligned with a related change in sales order routing. It updates internal tests so the system continues to validate rental sale behavior correctly after the route field structure changed.

To adapt for the changes in odoo/odoo#166512, the tests that use the old field `route_id` on `sale.order.line` (now `route_ids`) are modified accordingly.

Task-3563242

This change removes accounting tax code hooks that are no longer needed after a related enterprise change was reverted. It simplifies internal maintenance without changing day-to-day accounting workflows for users.

The code has been introduced initialy by:
https://github.com/odoo/odoo/commit/4cbd6cc52cb96cc20d41974a37410a37fd9902f5

...but since the override has been reverted in:
https://github.com/odoo/enterprise/commit/4f77e313ee9e97164f3ffe0e492f8f036fa53c50

... those hooks are no longer necessary.

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