Remove use of groups in realtime screen

[freddidierRTE]

Remove use of groups column in realtime screen , when a user member of the entity is connected the it count for 1 whatever the group is member of

Modify the list of connected login to add comma between logins

Add in migration guide

Config file shall change from :

  "realTimeScreens": [
    {
      "screenName": "All Control Centers",
      "screenColumns": [
        {
          "entitiesGroups": [
            {
              "name": "French Control Centers",
              "entities": [
                "ENTITY1_FR",
                "ENTITY2_FR",
                "ENTITY3_FR",
                "ENTITY4_FR"
              ],
              "groups": [
                "Dispatcher",
                "Planner"
              ]
            },
            {

to

  "realTimeScreens": [
    {
      "screenName": "All Control Centers",
      "screenColumns": [
        {
          "entitiesGroups": [
            {
              "name": "French Control Centers",
              "entities": [
                "ENTITY1_FR",
                "ENTITY2_FR",
                "ENTITY3_FR",
                "ENTITY4_FR"
              ]
        },