Distinguish Chat's insert and copy events and update Grafana

[satomic]

in metrics API Get Copilot metrics for a team, total_chat_insertion_events and total_chat_copy_events are 2 field.

"copilot_ide_chat": {
      "total_engaged_users": 13,
      "editors": [
        {
          "name": "vscode",
          "total_engaged_users": 13,
          "models": [
            {
              "name": "default",
              "is_custom_model": false,
              "custom_model_training_date": null,
              "total_engaged_users": 12,
              "total_chats": 45,
              "total_chat_insertion_events": 12,
              "total_chat_copy_events": 16
            },
            {
              "name": "a-custom-model",
              "is_custom_model": true,
              "custom_model_training_date": "2024-02-01",
              "total_engaged_users": 1,
              "total_chats": 10,
              "total_chat_insertion_events": 11,
              "total_chat_copy_events": 3
            }
          ]
        }
      ]
    }

This needs to be reflected in the visualization, not just an accept data which just sum of the 2 types of events.

[satomic]

fixed by #11