[clang-tidy][run-clang-tidy] Fix minor shutdown noise (llvm#105724)

On my new machine, the script outputs some shutdown noise:
```
Ctrl-C detected, goodbye.
Traceback (most recent call last):
  File "/home/nvankempen/llvm-project/./clang-tools-extra/clang-tidy/tool/run-clang-tidy.py", line 626, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.10/asyncio/base_events.py", line 636, in run_until_complete
    self.run_forever()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 603, in run_forever
    self._run_once()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1871, in _run_once
    event_list = self._selector.select(timeout)
  File "/usr/lib/python3.10/selectors.py", line 469, in select
    fd_event_list = self._selector.poll(timeout, max_ev)
KeyboardInterrupt
```

This fixes it. Also remove an unused typing import.
Relevant documentation:
https://docs.python.org/3/library/asyncio-runner.html#handling-keyboard-interruption

Author: nicovank

clang-tools-extra/clang-tidy/tool/run-clang-tidy.py

@@ -49,7 +49,7 @@
 import time
 import traceback
 from types import ModuleType
-from typing import Any, Awaitable, Callable, List, Optional, Tuple, TypeVar
+from typing import Any, Awaitable, Callable, List, Optional, TypeVar
 
 
 yaml: Optional[ModuleType] = None
@@ -621,4 +621,7 @@ async def main() -> None:
 
 
 if __name__ == "__main__":
-    asyncio.run(main())
+    try:
+        asyncio.run(main())
+    except KeyboardInterrupt:
+        pass

clang-tools-extra/docs/ReleaseNotes.rst

@@ -95,6 +95,9 @@ The improvements are...
 Improvements to clang-tidy
 --------------------------
 
+- Improved :program:`run-clang-tidy.py` script. Fixed minor shutdown noise
+  happening on certain platforms when interrupting the script.
+
 New checks
 ^^^^^^^^^^