When a blocking query on the client hits a retryable error, we change the max
query time so that it falls within the `RPCHoldTimeout` timeout. But when the
retry succeeds we don't reset it to the original value.
Because the calls to `Node.GetClientAllocs` reuse the same request struct
instead of reallocating it, any retry will cause the agent to poll at a faster
frequency until the agent restarts. No other current RPC on the client has this
behavior, but we'll fix this in the `rpc` method rather than in the caller so
that any future users of the `rpc` method don't have to remember this detail.
Fixes: https://github.com/hashicorp/nomad/issues/25033
5d09d7ad07