[clang-tools-extra] [llvm] [Github][CI] Add default gha user for tooling containers (PR #164294)

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:warning: Python code formatter, darker found issues in your code. :warning:

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``````````bash
darker --check --diff -r origin/main...HEAD llvm/utils/git/code-format-helper.py
``````````

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View the diff from darker here.
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``````````diff
--- code-format-helper.py	2025-10-24 22:06:14.000000 +0000
+++ code-format-helper.py	2025-10-24 22:07:45.751153 +0000
@@ -263,11 +263,11 @@
         if args.verbose:
             print(f"Running: {' '.join(cf_cmd)}")
         proc = subprocess.run(cf_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         sys.stdout.write(proc.stderr.decode("utf-8"))
 
-        if proc.returncode    != 0:
+        if proc.returncode != 0:
             # formatting needed, or the command otherwise failed
             if args.verbose:
                 print(f"error: {self.name} exited with code {proc.returncode}")
                 # Print the diff in the log so that it is viewable there
                 print(proc.stdout.decode("utf-8"))

``````````

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https://github.com/llvm/llvm-project/pull/164294