fix(A19): Forgot to flush TestBed

Added standalone false as default for mock-render and updated isStandalone method to handle angular 19+ default standalone behavior for components.

libs/ng-mocks/src/lib/common/func.is-standalone.spec.ts

@@ -0,0 +1,33 @@
+import { Component, VERSION } from '@angular/core';
+
+import { isStandalone } from './func.is-standalone';
+
+@Component({
+  selector: 'standalone',
+  template: `<div>
+    <h1>Angular 19 standalone</h1>
+  </div>`,
+})
+class StandaloneComponent {}
+
+describe('func.is-standalone', () => {
+  describe('Angular  Angular 19+ specific tests', () => {
+    let originalVersion: { major: string };
+    const setVersionMajor = (major: number) => {
+      Object.assign(VERSION, { major: major.toString() });
+    };
+
+    beforeAll(() => {
+      originalVersion = { ...VERSION };
+    });
+
+    afterEach(() => {
+      Object.assign(VERSION, originalVersion);
+    });
+
+    it('should return true when standalone is undefined', () => {
+      setVersionMajor(19);
+      expect(isStandalone(StandaloneComponent)).toBeTruthy();
+    });
+  });
+});