[FIX] web: select all feature now works as intended

Steps to follow

  - Go to the variant tab of a product
  - Add an attribute and click search more
  - Select the checkbox at the top to select all records from the current page
  - Click on Select all
  - Click on Select
  -> Only the records from the first page are added

Cause of the issue

  `getSelectedRecords` doesn't return the record from all pages
  but only from the current one

Solution

  If the domain is selected, use all the records

opw-2586877

closes odoo/odoo#76165

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>