[ingvarch]

What changes

The screen of a client no longer warns and polls every 2 seconds with a token that may read jobs in some namespaces only. It follows Allocation and Node in every namespace, a stream such a token is refused since hashicorp/nomad#25089.

• When the cluster refuses that stream, with an error such as a 403 or by ending it within 5 seconds with no event (Nomad 2.0), the screen follows the clients alone, with no warning, the way the client list does since Show a full client on the client list without waiting for the poll #169. Its allocations are then read on the 30 s poll and whenever a client changes.
• A refusal of the clients too warns and polls as before, and a stream that worked and then dropped is a drop, not a refusal.
• Each time the screen opens it asks for both again; the fallback of the client list does not carry over to it.
• docs/configuration.md says this.

Left as they are: the jobs of a node pool and screens with the session in all namespaces ask for every namespace too, and with such a token still warn and poll fast. They have no smaller set of topics to follow.

Closes #186

Checklist

• The test for this change was written first and failed
• make check is green
• The title is a conventional commit: feat(ui): ..., fix(nomad): ...