PCHR-4094: Add admin to leave request managees list

[igorpavlov-zz]

Overview

As per #1999 the admin was excluded from the list of managed contacts, admin was not able to create approved requests for themselves.

Now, admins are always treated as self leave approvers. This PR allows admins to select themselves from the managees list to create a leave request for themselves.

Before

Admin admin@example.com does not appear in the list:

After

Admin admin@example.com appears in the list:

Technical Details

Simply remove the existing code that checks if the user is admin and removes them from the list:

function loadManagees () {
  if (vm.selectedContactId) {
    // ...
  } else if (vm.isRole('admin')) {
    return Contact.all()
      .then(function (contacts) {
        // vm.managedContacts = _.remove(contacts.list, function (contact) {
        //   return contact.id !== loggedInContact.id;
        vm.managedContacts = contacts.list; // no check needed anymore
  } else {
    // ...

---

✅Manual Tests - passed
✅Jasmine Tests - amended and passed
✅JS distributive files - included
⏹CSS distributive files - not needed
⏹Backstop tests - not needed
⏹PHP Unit Tests - not needed

[deb1990]

Please update the doc for loadManagees, adding a note saying that the admin itself is also part of the managedContact. Normally by managees one does not think of himself.

Also we need to know why exactly the admin was removed from managees before. I already found that it was done as part of #1999, as a requirement. Could you please add this in the PR documentation.