Alertmanager: Display alert receiver in alert list

[mxinden]

In the alert list view display the receiver of each alert.

As suggested by @w0rm here this could be part of the info-collapse-section.

[w0rm]

@mxinden are there multiple receivers per alert? I wonder if we can also make them clickable.

[mxinden]

@w0rm Yes, the receivers endpoint returns an array, which can contain multiple receivers. Making them clickable would be great!

{
  "status": "success",
  "data": [
    "web.hook",
    "web.hook2"
  ]
}