fix(ios): cancel pending local notifications (8_0_X)

[janvennemann]

JIRA: https://jira.appcelerator.org/browse/TIMOB-26594

8_0_X backport of #10501

[ssjsamir]

FR Passed Using the following test case

var window = Ti.UI.createWindow({
  backgroundColor: 'white'
});

var button = Ti.UI.createButton({
  title: 'Schedule'
});

var isScheduling = true;
button.addEventListener('click', function() {
  if (isScheduling) {
    var alarmObject = {
      date: new Date(new Date().getTime() + 20000),
      alertBody: "Hello world",
      badge: 1,
      identifier: "test_id",
      sound: 'default'
    };

    console.log('schedule: ' + JSON.stringify(alarmObject));

    Ti.App.iOS.scheduleLocalNotification(alarmObject);

    button.title = "Cancel";
  } else {
    Ti.App.iOS.UserNotificationCenter.getPendingNotifications(function(result) {
      if (result && result.notifications && result.notifications.length) {
        console.log(result.notifications);
        var _;
        var notificationsToCancel = result.notifications

        console.log('cancel these: ' + JSON.stringify(notificationsToCancel));

        if (notificationsToCancel) {
          Ti.App.iOS.UserNotificationCenter.removePendingNotifications(notificationsToCancel);
        }
      }
    });

    button.title = "Schedule";
  }

  isScheduling = !isScheduling;
});

window.add(button);

window.addEventListener('open', function() {
  Ti.App.iOS.registerUserNotificationSettings({
    types: [
      Ti.App.iOS.USER_NOTIFICATION_TYPE_ALERT,
      Ti.App.iOS.USER_NOTIFICATION_TYPE_SOUND,
      Ti.App.iOS.USER_NOTIFICATION_TYPE_BADGE
    ]
  });
});

window.open();

Application no longer shows an error unlike 7.5.0.GA.

Test Environment

iPhone 6s plus (9.3) Sim
APPC CLI: 7.0.0
Operating System Name: Mac OS Mojave
Operating System Version: 10.14.2
Node.js Version: 8.9.1
Xcode 10.1

[build]

	Fails
🚫	🔬 There are library changes, but no changes to the unit tests. That's OK as long as you're refactoring existing code, but will require an admin to merge this PR. Please see README.md#unit-tests for docs on unit testing.
🚫	Tests have failed, see below for more information.

	Messages
📖	💾 Here's the generated SDK zipfile.
📖	❌ 3 tests have failed There are 3 tests failing and 449 skipped out of 2983 total tests.

Tests:

Classname	Name	Time	Error
android.Titanium.UI.Layout	TIMOB-23372 #3	5.754	timeout of 5000ms exceeded
android.Titanium.UI.TabbedBar	Labels update	3.171	tabbedBar.labels.get is not a function
ios.Titanium.UI.TabbedBar	Labels update	0.006	tabbedBar.labels.get is not a function. (In 'tabbedBar.labels.get(1)', 'tabbedBar.labels.get' is undefined)

Generated by 🚫 dangerJS against c577869