[FIX] project: remove partner_autocomplete assets

Issue:
------
The `partner_autocomplete` module is an automatically installed module.
This module is not included in the dependencies
and can therefore be uninstalled.

If `partner_autocomplete` is uninstalled and we go to a shared project
with a portal user for example, we get an internal server error,
as we don't have access to the `partner_autocomplete` files.

Solution:
---------
Remove the `partner_autocomplete` files from the manifest file
of the `project` module.

Note:
If the widget is not found (in the very rare case of uninstalling
the `partner_autocomplete` module), we will use the
default widget (and create a log).

opw-3774575

closes odoo/odoo#157965

X-original-commit: 65331aee3b7c74752aed23e136f08ff1fb5d282d
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>
Signed-off-by: Thomas Lefebvre (thle) <thle@odoo.com>

addons/project/__manifest__.py

@@ -195,9 +195,6 @@
             'project/static/src/components/project_task_name_with_subtask_count_char_field/*',
             'project/static/src/components/project_task_state_selection/*',
             'project/static/src/components/project_many2one_field/*',
-            'partner_autocomplete/static/src/js/partner_autocomplete_core.js',
-            'partner_autocomplete/static/src/js/partner_autocomplete_many2one.js',
-            'partner_autocomplete/static/src/xml/partner_autocomplete.xml',
             'project/static/src/views/project_task_form/*.scss',
 
             'project/static/src/project_sharing/search/favorite_menu/custom_favorite_item.xml',

addons/project/views/project_sharing_project_task_views.xml

@@ -110,6 +110,9 @@
                 <attribute name="delete">0</attribute>
                 <attribute name="import">0</attribute>
             </tree>
+            <xpath expr="//field[@widget='res_partner_many2one']" position="attributes">
+                <attribute name="widget">many2one</attribute>
+            </xpath>
             <field name="user_ids" position="replace">
                 <field name="portal_user_names" string="Assignees"/>
             </field>