fix(tests): alert.alertmanager doesn't have uri key

ui/src/Components/Grid/AlertGrid/AlertGroup/Silence/index.test.js

@@ -16,7 +16,6 @@ const mockAfterUpdate = jest.fn();
 
 const alertmanager = {
   name: "default",
-  uri: "http://localhost",
   state: "suppressed",
   startsAt: "2000-01-01T10:00:00Z",
   endsAt: "0001-01-01T00:00:00Z",

ui/src/Models/API.js

@@ -11,7 +11,6 @@ const Annotation = PropTypes.exact({
 
 const APIAlertAlertmanagerState = PropTypes.exact({
   name: PropTypes.string.isRequired,
-  uri: PropTypes.string.isRequired,
   state: AlertState.isRequired,
   startsAt: PropTypes.string.isRequired,
   endsAt: PropTypes.string.isRequired,

ui/src/__mocks__/Alerts.js

@@ -14,7 +14,6 @@ const MockAlert = (annotations, labels, state) => ({
   alertmanager: [
     {
       name: "default",
-      uri: "file:///mock",
       state: "active",
       startsAt: "2018-08-14T17:36:40.017867056Z",
       endsAt: "0001-01-01T00:00:00Z",