[ROCm] Set HSA_NO_SCRATCH_RECLAIM=1 in ROCm test workflows
Required on gfx950 with recent ROCm to avoid HIP "invalid device function"
failures during multi-accelerator collectives; the env var must be set before
HIP initialization (JAX import time).
(cherry picked from commit 756fa6a25251eed0a64ba6e1e4a0f212b8abf4b1)
