Yossi Itigin

UCT/IB: Consider number of supported completion vectors

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## Why Fix JUCX test failures found in #9904

TEST/CALLBACKQ: Fix test_callbackq.test_callbackq test failures

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## Why Fix test failures like: ``` 2024-07-10T10:31:07.4474989Z [ RUN ] test_callbackq.oneshot_mt/mt_10 2024-07-10T10:31:07.4478332Z /scrap/azure/agent-04/AZP_WORKSPACE/1/s/contrib/../test/gtest/ucs/test_callbackq.cc:360: Failure 2024-07-10T10:31:07.4478820Z Expected equality of these values: 2024-07-10T10:31:07.4479038Z 1u 2024-07-10T10:31:07.4479254Z Which is: 1 2024-07-10T10:31:07.4479513Z ctx.count 2024-07-10T10:31:07.4479810Z...

## Why Don't require adding 'cuda' to UCX_TLS (when setting UCX_TLS explicitly) in order to detect GPU memory. ## How - Introduce UCX_MEM_TLS config param that configures memory detection transports...