[MOV] account_sale_timesheet,sale_project_account: remove useless bridges

Since the sale module depends on the account module, the bridges account_sale_timesheet
and sale_project_account can be merged with sale_project.

This commit removes those bridges and merges them with sale_project.

Task-2772395

closes odoo/odoo#86045

Related: odoo/upgrade#3321
Signed-off-by: Laurent Stukkens (ltu) <ltu@odoo.com>