[clang-tools-extra] Allow to pass config file to clang-tidy-diff (PR #75457)

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``````````bash
darker --check --diff -r 2952bc3384412ca67fd1dcd2eac595088d692802...05aff16d9b117e7e04c5342ec1792c91ef41e48b clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
``````````

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View the diff from darker here.
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``````````diff
--- clang-tidy-diff.py	2023-12-14 10:31:28.000000 +0000
+++ clang-tidy-diff.py	2023-12-14 10:37:50.326684 +0000
@@ -171,12 +171,16 @@
     parser.add_argument(
         "-checks",
         help="checks filter, when not specified, use clang-tidy " "default",
         default="",
     )
-    parser.add_argument("-config-file", dest="config_file",
-        help="Specify the path of .clang-tidy or custom config file",default="")
+    parser.add_argument(
+        "-config-file",
+        dest="config_file",
+        help="Specify the path of .clang-tidy or custom config file",
+        default="",
+    )
     parser.add_argument("-use-color", action="store_true", help="Use colors in output")
     parser.add_argument(
         "-path", dest="build_path", help="Path used to read a compile command database."
     )
     if yaml:

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https://github.com/llvm/llvm-project/pull/75457