[ui] Give explanation for hasStoppedRescheduling

[philrenaud]

It would be nice to know why an allocation has stopped rescheduling:

Relevant computed prop: https://github.com/hashicorp/nomad/tree/main/ui/app/models/allocation.js#L166-L177

Ideally we could provide a hasStoppedReschedulingReason string property to users that gives better specifics.

[lattwood]

We ran into this issue on a job with the follow (JSON) restart policy

        "ReschedulePolicy": {
          "Attempts": 0,
          "Interval": 0,
          "Delay": 5000000000,
          "DelayFunction": "constant",
          "MaxDelay": 3600000000000,
          "Unlimited": true
        }