[llvm] [offload] Add CUDA_ROOT to path for unit tests (PR #214282)

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``````````diff
--- lit.cfg.py	2026-08-05 16:16:12.000000 +0000
+++ lit.cfg.py	2026-08-05 16:51:35.778338 +0000
@@ -11,15 +11,17 @@
 config.name = "Offload-Unit"
 
 # suffixes: A list of file extensions to treat as test files.
 config.suffixes = []
 
+
 def prepend_executable_path(path):
     old_path = config.environment.get("PATH")
     config.environment["PATH"] = (
         f"{path}{os.path.pathsep}{old_path}" if old_path else path
     )
+
 
 # Add the tools bin dir to the search path so the JIT tests can
 # find it. Prefer the tools from the configured LLVM install or
 # bootstrapping build.
 if config.bin_llvm_tools_dir:

``````````

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https://github.com/llvm/llvm-project/pull/214282