UCT/DEVICE: fix gda qp state (#11517)

* UCT/GDAKI: Reset pooled QPs before reconnect

Reuse of pooled GDAKI channel blocks left QPs in RTS, so reconnect
failed when devx_connect_qp expected INIT. Reset QPs on cleanup and
reconnect, and add a shared devx RST2INIT helper.

* GTEST/GDAKI: test for reconnect

* UCT/GDAKI: fix build

* GTEST/GDAKI: fix test

* UCT/GDKAI: fix according to comments

* UCT/GDKAI: fix according to comments

* UCT/GDAKI: address comments

* UCT/GDAKI: address comments

* UCT/GDAKI: reverse qps block reset

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Co-authored-by: Zihao Zhao <zizhao@nvidia.com>