[FIX] web: missing action id warnings

* Add test name when logging missing action ids, makes finding out
  which test causes the issue much simpler.
* Suppress the warning emission in the one remaining test which
  triggers it, as testing invalid action IDs is exactly the purpose of
  the test.

addons/web/static/tests/helpers/mock_server.js

@@ -498,7 +498,7 @@ export class MockServer {
         if (!action) {
             // when the action doesn't exist, the real server doesn't crash, it
             // simply returns false
-            console.warn("No action found for ID " + kwargs.action_id);
+            console.warn(`No action found for ID ${kwargs.action_id} during test ${QUnit.config.current.testName}`);
         }
         return action || false;
     }

addons/web/static/tests/legacy/helpers/mock_server.js

@@ -1160,7 +1160,7 @@ var MockServer = Class.extend({
         if (!action) {
             // when the action doesn't exist, the real server doesn't crash, it
             // simply returns false
-            console.warn("No action found for ID " + kwargs.action_id);
+            console.warn(`No action found for ID ${kwargs.action_id} during test ${QUnit.config.current.testName} (legacy)`);
         }
         return action || false;
     },

addons/web/static/tests/webclient/actions/misc_tests.js

@@ -6,7 +6,7 @@ import core from "web.core";
 import testUtils from "web.test_utils";
 import Widget from "web.Widget";
 import { makeTestEnv } from "../../helpers/mock_env";
-import { legacyExtraNextTick, patchWithCleanup } from "../../helpers/utils";
+import {hushConsole, legacyExtraNextTick, patchWithCleanup} from "../../helpers/utils";
 import {
     createWebClient,
     doAction,
@@ -97,6 +97,7 @@ QUnit.module("ActionManager", (hooks) => {
     QUnit.test("properly handle case when action id does not exist", async (assert) => {
         assert.expect(2);
         const webClient = await createWebClient({ serverData });
+        patchWithCleanup(window, {console: hushConsole}, {pure: true});
         patchWithCleanup(webClient.env.services.notification, {
             add(message) {
                 assert.strictEqual(message, "No action with id '4448' could be found");