[MERGE] project, hr_expense: Fix several multi-company issues + tests

Purpose
Fix multi-company access issues following the big changes that happened
(the 13.0). Make the usability better in order to avoid potential
multi-company issues for the user.

Specification
Check the related commits to see the different fixes that have been
made. For more information about the technical/functional considerations,
check the related task.

Taskid: 2088891
X-original-commit: 5c8df3a5e5f7960e5eab6439e0a32a06224ba826