[ROCm][CI] Add distributed testing back to trunk.yml (#166915)
Adding distributed testing back to trunk since we have been observing [reasonable queueing](https://hud.pytorch.org/queue_time_analysis?dateRange=30&startDate=2025-10-05T01%3A44%3A55.924Z&endDate=2025-11-04T01%3A44%3A55.925Z&granularity=week&chartType=bar&repos=pytorch%2Fpytorch&category=machine_type&machineTypes=linux.rocm.gpu.gfx942.1&items=linux.rocm.gpu.gfx942.1) based on current MI3xx capacity.
Partially addresses https://github.com/pytorch/pytorch/issues/166108.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/166915
Approved by: https://github.com/jeffdaily
