trunk/71b32515a2bec7d2dc41378630f25646606e8458: Stop double-running inductor tests on ROCm default shards (#197313)

发生了什么

Motivation The linux-noble-rocm-py3.11-mi300 default shards are running at roughly 90 percent of their 270-minute step timeout, and timeout failures on main rose from about 1 percent through August to 5.6 percent in the week of 2026-09-06. The cause is not test growth: tests per shard has been flat since July. The default config selects files by discovery and so picks up every inductor/* file, while the inductor con…

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