[FIX] web: do not display cover images in sample data

Before this commit, in sample mode, cover images might be displayed
in kanban views. It isn't what we want as those images are real
images from the database, not sample ones, but randomly linked to
the sample records (the id of many2one fields is randomly generated).

This commit tweaks the SampleServer to always set many2one fields
pointing to model 'ir.attachment' to false.

task-2368505

closes odoo/odoo#66381

X-original-commit: f7b2a5825e3786be53d04276af4c4c403b7a293e
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/js/views/sample_server.js

@@ -250,6 +250,9 @@
                     if (field.relation === 'res.currency') {
                         return session.company_currency_id;
                     }
+                    if (field.relation === 'ir.attachment') {
+                        return false;
+                    }
                     return this._getRandomSubRecordId();
                 case "one2many":
                 case "many2many": {

addons/web/static/tests/views/sample_server_tests.js

@@ -54,6 +54,7 @@ odoo.define('web.sample_server_tests', function (require) {
                     salary: { string: "Salary", type: 'monetary' },
                     currency: { string: "Currency", type: 'many2one', relation: 'res.currency' },
                     manager_id: { string: "Manager", type: 'many2one', relation: 'res.users' },
+                    cover_image_id: { string: "Cover Image", type: 'many2one', relation: 'ir.attachment' },
                     managed_ids: { string: "Managing", type: 'one2many', relation: 'res.users' },
                     tag_ids: { string: "Tags", type: 'many2many', relation: 'tag' },
                     type: { string: "Type", type: 'selection', selection: [
@@ -70,6 +71,9 @@ odoo.define('web.sample_server_tests', function (require) {
                     ] },
                     age: { string: "Age", type: 'integer' },
                 },
+                'ir.attachment': {
+                    display_name: { string: "Name", type: 'char' },
+                }
             };
         },
     }, function () {
@@ -77,7 +81,7 @@ odoo.define('web.sample_server_tests', function (require) {
         QUnit.module("Basic behaviour");
 
         QUnit.test("Sample data: people type + all field names", async function (assert) {
-            assert.expect(25);
+            assert.expect(26);
 
             mock.patch(session, {
                 company_currency_id: 4,
@@ -150,6 +154,8 @@ odoo.define('web.sample_server_tests', function (require) {
             assert.strictEqual(typeof rec.manager_id[0], 'number');
             assert.ok(SAMPLE_PEOPLE.includes(rec.manager_id[1]));
 
+            assert.strictEqual(rec.cover_image_id, false);
+
             assert.strictEqual(rec.managed_ids.length, 2);
             assert.ok(rec.managed_ids.every(
                 (id) => typeof id === 'number')