[clang] [DTLTO][TEST] Make Clang driver tests more robust (PR #159151)

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darker --check --diff -r origin/main...HEAD clang/test/Driver/DTLTO/filename.py
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``````````diff
--- filename.py	2025-09-16 18:50:42.000000 +0000
+++ filename.py	2025-09-16 18:54:52.137792 +0000
@@ -1,3 +1,4 @@
 from pathlib import Path
 import sys
+
 print(f"filename.py:{Path(sys.argv[1]).name}")

``````````

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https://github.com/llvm/llvm-project/pull/159151