[llvm] [Offload] Add check-offload-unit for liboffload unittests (PR #137312)

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``````````bash
darker --check --diff -r HEAD~1...HEAD offload/test/unit/lit.cfg.py
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``````````diff
--- lit.cfg.py	2025-04-25 10:31:44.000000 +0000
+++ lit.cfg.py	2025-04-25 10:57:36.604943 +0000
@@ -11,11 +11,11 @@
 config.name = "Offload-Unit-{}".format(config.offload_platform)
 
 # suffixes: A list of file extensions to treat as test files.
 config.suffixes = []
 
-config.environment = { "OFFLOAD_UNITTEST_PLATFORM" : config.offload_platform}
+config.environment = {"OFFLOAD_UNITTEST_PLATFORM": config.offload_platform}
 
 # test_source_root: The root path where tests are located.
 # test_exec_root: The root path where tests should be run.
 config.test_exec_root = os.path.join(config.library_dir, "unittests")
 config.test_source_root = config.test_exec_root

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https://github.com/llvm/llvm-project/pull/137312