feat(employee): Added functionality to invite multiple emailaddresses. (TV-512)

Squashed commit of the following:

commit 04baa8e9398016ffb0cba618a5b857230dc4ea9e
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Mon Sep 6 10:52:12 2021 +0200

    moved email-regex

commit 0f54392c2e65386f4d0ae79493f6d33d84e313fe
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Mon Sep 6 07:54:13 2021 +0200

    Updated confirmation texts

commit 4557c8203cf826caccff7ac174e15b547f041993
Merge: ec932ec ec7b4fc
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Mon Sep 6 07:37:56 2021 +0200

    Merge branch 'develop' into feature/TV-512-inbjudningar

commit ec932ecad69b96504b2d25f937aa4b6def646f11
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Fri Sep 3 16:08:22 2021 +0200

    Now possible to add commaseparated list of emails

mock-api/mina-sidor-fa/server.js

@@ -62,6 +62,8 @@ router.render = (req, res) => {
           invitedUsers: req.body.emails,
           assignedUsers: [],
           existingUsersInCurrentOrg: [],
+          failedInvite: [],
+          alreadyInvitedUsers: [],
         },
       });
     }