Add OutletComponent with router outlet and basic unit tests

src/angular/frontend/src/app/components/outlet/outlet.component.html

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+<router-outlet/>

src/angular/frontend/src/app/components/outlet/outlet.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { OutletComponent } from './outlet.component';
+
+describe('OutletComponent', () => {
+  let component: OutletComponent;
+  let fixture: ComponentFixture<OutletComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [OutletComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(OutletComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/angular/frontend/src/app/components/outlet/outlet.component.ts

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+import { Component } from '@angular/core';
+import {RouterOutlet} from '@angular/router';
+
+@Component({
+  selector: 'app-outlet',
+  imports: [
+    RouterOutlet
+  ],
+  templateUrl: './outlet.component.html',
+  styleUrl: './outlet.component.scss'
+})
+export class OutletComponent {
+
+}