[clang-tools-extra] [NFC][clang-tidy] Add type annotations to check_clang_tidy (PR #133140)

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``````````bash
darker --check --diff -r 545ea0dd378912d588550a79728cc98cd4dbaa24...48bb3c79069c9bad5ee01865058a155368586b2e clang-tools-extra/test/clang-tidy/check_clang_tidy.py
``````````

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View the diff from darker here.
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``````````diff
--- check_clang_tidy.py	2025-03-27 17:28:59.000000 +0000
+++ check_clang_tidy.py	2025-03-27 17:33:17.048667 +0000
@@ -70,11 +70,10 @@
     return process_output
 
 
 # This class represents the appearance of a message prefix in a file.
 class MessagePrefix:
-
     def __init__(self, label: str) -> None:
         self.has_message = False
         self.prefixes: List[str] = []
         self.label = label
 
@@ -85,11 +84,10 @@
             self.prefixes.append(self.prefix)
         return self.has_message
 
 
 class CheckRunner:
-
     def __init__(self, args: argparse.Namespace, extra_args: List[str]) -> None:
         self.resource_dir = args.resource_dir
         self.assume_file_name = args.assume_filename
         self.input_file_name = args.input_file_name
         self.check_name = args.check_name

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https://github.com/llvm/llvm-project/pull/133140