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