DAOS-16486 object: return proper error on stale pool map (#15064)

[NiuYawei]

Client with stale pool map may try to send RPC to a DOWN target, if the target was brought DOWN due to faulty NVMe device, the ds_pool_child could have been stopped on the NVMe faulty reaction, We'd ensure proper error code is returned for such case.

Allow-unstable-test: true

Required-githooks: true

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[github-actions]

Ticket title is 'LRZ: IOR job does not survive setting one NVMe disk to faulty'
Status is 'In Progress'
Labels: 'lrz,scrubbed_2.8'
https://daosio.atlassian.net/browse/DAOS-16486