Fix Epic subscription toggle behaviour

ee/app/assets/javascripts/epics/sidebar/components/sidebar_app.vue

@@ -167,7 +167,7 @@ export default {
       savingTodoAction: false,
       service: new SidebarService({
         endpoint: this.endpoint,
-        subscriptionEndpoint: this.subscriptionEndpoint,
+        subscriptionEndpoint: this.toggleSubscriptionPath,
         todoPath: this.todoPath,
       }),
       epicContext: {

ee/changelogs/unreleased/7445-fix-epic-toggle-subscription.yml

+---
+title: Fix Epic subscription toggle behaviour
+merge_request: 7723
+author:
+type: fixed

ee/spec/javascripts/epics/sidebar/components/sidebar_app_spec.js

@@ -76,6 +76,12 @@ describe('epicSidebar', () => {
     Cookies.set('collapsed_gutter', originalCookieState);
   });
 
+  it('should initialize service with correct endpoints', () => {
+    expect(vm.service.endpoint.length > 0).toBe(true);
+    expect(vm.service.subscriptionEndpoint.length > 0).toBe(true);
+    expect(vm.service.todoPath.length > 0).toBe(true);
+  });
+
   it('should render right-sidebar-expanded class when not collapsed', () => {
     expect(vm.$el.classList.contains('right-sidebar-expanded')).toEqual(true);
   });