trunk/6e700ca9014c0c7ba112f66d02a2e81b94cc1f20: Handle non-UTF-8 subprocess output in minifier isolate_fails (#196620)

发生了什么

#190696 added errors="replace" decoding to the minifier test harness after the ROCm flake in #190681 , but the production minifier has its own decode sites: isolate_fails reads the isolated subprocess's stdout/stderr logs with bare decode("utf-8") calls. When the subprocess emits a non-UTF-8 byte (0xb1 from HIP runtime output on ROCm), isolate_fails raises UnicodeDecodeError, minification dies before repro.py is wri…

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