[clang-tools-extra] [clang-tidy] Add support for `-ignore-insert-conflict` in `run-clang-tidy.py` (PR #127066)

[Vicente Mataix Ferrándiz via cfe-commits]

================
@@ -446,6 +448,12 @@ async def main() -> None:
         action="store_true",
         help="Allow empty enabled checks.",
     )
+    parser.add_argument(
+        "-ignore-insert-conflict",
+        action="store_true",
+        default=True,
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loumalouomega wrote:

I was asked to preserve current behaviour

https://github.com/llvm/llvm-project/pull/127066