Revert "Redirect old location module imports to standard provider (ap…

…ache#43610)" (apache#43946)

There is a very interesting breaking change introduced in Python 3.11
that will likely mean that we should not use MetaPathFinder for old
standard provider classes redirection.

There was a change introduced in Python 3.11 that caused that
module might not be found in some cases (for example when
unit test patches the path) when the module is loaded as
a different module (i.e. a.b differs from sys.modules['a.b'])

This is tracked in CPython via:
python/cpython#117860

This causes standard operator's tests fail in Python 3.11 and
3.12 when the providers/tests/standard/test_module_redirect_finder.py
is executed before - i.e. the standard modules are loaded as
old modules.

This reverts commit 5de2e73.

airflow/__init__.py

@@ -30,7 +30,6 @@
 import os
 import sys
 import warnings
-from importlib.abc import MetaPathFinder
 from typing import TYPE_CHECKING
 
 if os.environ.get("_AIRFLOW_PATCH_GEVENT"):
@@ -134,40 +133,3 @@ def __getattr__(name: str):
     from airflow import plugins_manager
 
     plugins_manager.ensure_plugins_loaded()
-
-
-class ModuleRedirectFinder(MetaPathFinder):
-    def __init__(self, redirects: dict[str, str]):
-        self.redirects: dict[str, str] = redirects
-
-    def find_spec(self, old_module: str, path, target=None):
-        import importlib
-
-        if old_module in self.redirects:
-            new_module_name = self.redirects[old_module]
-            warnings.warn(
-                f"Module '{old_module}' is deprecated, Please import it from '{new_module_name}'.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-            return importlib.util.find_spec(new_module_name)
-        return None
-
-
-module_redirects_references: dict[str, str] = {
-    "airflow.operators.python": "airflow.providers.standard.operators.python",
-    "airflow.operators.bash": "airflow.providers.standard.operators.bash",
-    "airflow.operators.datetime": "airflow.providers.standard.operators.datetime",
-    "airflow.operators.weekday": "airflow.providers.standard.operators.weekday",
-    "airflow.sensors.bash": "airflow.providers.standard.sensors.bash",
-    "airflow.sensors.date_time": "airflow.providers.standard.sensors.date_time",
-    "airflow.sensors.python": "airflow.providers.standard.sensors.python",
-    "airflow.sensors.time": "airflow.providers.standard.sensors.time",
-    "airflow.sensors.time_delta": "airflow.providers.standard.sensors.time_delta",
-    "airflow.sensors.weekday": "airflow.providers.standard.sensors.weekday",
-    "airflow.hooks.filesystem": "airflow.providers.standard.hooks.filesystem",
-    "airflow.hooks.package_index": "airflow.providers.standard.hooks.package_index",
-    "airflow.hooks.subprocess": "airflow.providers.standard.hooks.subprocess",
-    "airflow.utils.python_virtualenv": "airflow.providers.standard.utils.python_virtualenv",
-}
-sys.meta_path.append(ModuleRedirectFinder(module_redirects_references))