[IMP] product: pricelist flow

Pricelist flow isn't quite intuitive in its current state (and certainly not clean in a technical point of view).

# Improvements
1. Price Rules are opened in independent view from the product/product template.
2. Price rules of a product are still accessible in advanced pricelist mode.
* From a product.template : You see the rules on this product and on its variants
* From a product.product : You see the rules on the variant and on its template
3. UI refactorings

## Other changes
* Don't create a rule for all pricelist by default.  If no rule is defined on a pricelist for a given product, it takes the sales price by default.
* Technical : multiple overly complicated pricelist settings are removed.

[Task 34788](https://www.odoo.com/web?#id=34788&action=333&active_id=1725&model=project.task&view_type=form&menu_id=4720)

closes odoo/odoo#35432

Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

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