[FIX] project: fix access error when internal user access to project

form

Before this commit, when the internal user without any access rights to
the Project app and has a link to access to the form view of a "public"
project, an access error is occurred when that user when to access to
the
project form view. The reason is the `project.collaborator` is only
accessible to the user with an access right to the Project App and since
the number of collaborators displayed in a stat button is computed with
the access rights of the current user, the compute cannot be done for
the
internal user.

This commit executes the compute is superuser to prevent the user having
access error and to correctly access to the project form view as before.

Steps to reproduce the bug:
--------------------------
1) Create a Project P and add *Marc Demo* in the followers of that
project
   if the Privacy Visibility is "Invited internal users".
2) Remove the access rights to the Project app for *Marc Demo* user.
3) Copy the link to the form view of project P.
4) Log in as *Marc Demo*.
5) Paste the link copied in step 3 to access to the form view of project
P.

Actual Behavior:
---------------
An access error is occurred because the user without any access to the
Project app cannot access to the `project.collaborator` model.

Expected Behavior:
-----------------
The internal user without any access rights to the Project App should
access
to the form view of the project P.

closes odoo/odoo#96497

X-original-commit: c725c3fbb29eff49eff3794aff9d407175599e63
Signed-off-by: Xavier <xbo@odoo.com>

addons/project/models/project.py

@@ -352,7 +352,7 @@ class Project(models.Model):
 
     # Project Sharing fields
     collaborator_ids = fields.One2many('project.collaborator', 'project_id', string='Collaborators', copy=False)
-    collaborator_count = fields.Integer('# Collaborators', compute='_compute_collaborator_count')
+    collaborator_count = fields.Integer('# Collaborators', compute='_compute_collaborator_count', compute_sudo=True)
 
     # rating fields
     rating_request_deadline = fields.Datetime(compute='_compute_rating_request_deadline', store=True)