Don't check for __init__.py under pycache folders. (apache#18238)

Otherwise we end up with errors like this from pre-commit:

```
No __init__.py file was found in the following provider directories:
/home/ash/code/airflow/airflow/airflow/providers/airbyte/__pycache__
/home/ash/code/airflow/airflow/airflow/providers/airbyte/hooks/__pycache__
/home/ash/code/airflow/airflow/airflow/providers/airbyte/operators/__pycache__
```

scripts/ci/pre_commit/pre_commit_check_providers_subpackages_all_have_init.py

@@ -26,9 +26,11 @@
 
 def check_dir_init_file(provider_files: List[str]) -> None:
     missing_init_dirs = []
-    for dags_file in provider_files:
-        if os.path.isdir(dags_file) and not os.path.exists(os.path.join(dags_file, "__init__.py")):
-            missing_init_dirs.append(dags_file)
+    for path in provider_files:
+        if path.endswith("/__pycache__"):
+            continue
+        if os.path.isdir(path) and not os.path.exists(os.path.join(path, "__init__.py")):
+            missing_init_dirs.append(path)
 
     if missing_init_dirs:
         with open(os.path.join(ROOT_DIR, "license-templates/LICENSE.txt")) as license: