LPS-50327 Fix tests
LPS-50327 Add method to create an admin user to a company
LPS-50327 Create an admin user in the company to verify that is omni-admin.

As @zxdgoal said, the method getUser() will return the first user with role of administrator which should be the omni-admin as it is also the first one added company admin. For him/her the result is always TRUE
LPS-50327 Test company admin whose company is not the default one.
LPS-50327 SF