Refactor metrics handling and improve logging

- Removed the MetricsManager initialization from `run_helper.py` to avoid duplication, as metrics are now handled in `main.py`.
- Updated logging levels in `server_prometheus.py` and `metrics_middleware.py` to use debug instead of info for less critical messages.
- Added metrics configuration to `BaseDependencyFactory` for better management of metrics settings.
- Deleted the obsolete `metrics_exporter.py` file to streamline the codebase.
- Updated various tests to reflect changes in the metrics handling and ensure proper functionality.

tests/test_refactored_private_handlers.py

@@ -19,13 +19,13 @@ class TestPrivateHandlers:
     def mock_db(self):
         """Mock database"""
         db = Mock()
-        db.user_exists.return_value = False
-        db.add_new_user_in_db = Mock()
-        db.update_date_for_user = Mock()
-        db.update_info_about_stickers = Mock()
-        db.add_post_in_db = Mock()
-        db.add_new_message_in_db = Mock()
-        db.update_helper_message_in_db = Mock()
+        db.user_exists = AsyncMock(return_value=False)
+        db.add_user = AsyncMock()
+        db.update_user_date = AsyncMock()
+        db.update_stickers_info = AsyncMock()
+        db.add_post = AsyncMock()
+        db.add_message = AsyncMock()
+        db.update_helper_message = AsyncMock()
         return db
     
     @pytest.fixture
@@ -101,7 +101,8 @@ class TestPrivateHandlers:
         
         # Mock the check_user_emoji function
         with pytest.MonkeyPatch().context() as m:
-            m.setattr('helper_bot.handlers.private.private_handlers.check_user_emoji', lambda x: "😊")
+            mock_check_emoji = AsyncMock(return_value="😊")
+            m.setattr('helper_bot.handlers.private.private_handlers.check_user_emoji', mock_check_emoji)
             
             # Test the handler
             await handlers.handle_emoji_message(mock_message, mock_state)
@@ -121,7 +122,8 @@ class TestPrivateHandlers:
         with pytest.MonkeyPatch().context() as m:
             m.setattr('helper_bot.handlers.private.private_handlers.get_first_name', lambda x: "Test")
             m.setattr('helper_bot.handlers.private.private_handlers.messages.get_message', lambda x, y: "Hello Test!")
-            m.setattr('helper_bot.handlers.private.private_handlers.get_reply_keyboard', lambda x, y: Mock())
+            mock_keyboard = AsyncMock(return_value=Mock())
+            m.setattr('helper_bot.handlers.private.private_handlers.get_reply_keyboard', mock_keyboard)
             
             # Test the handler
             await handlers.handle_start_message(mock_message, mock_state)
@@ -130,8 +132,8 @@ class TestPrivateHandlers:
             mock_state.set_state.assert_called_once_with(FSM_STATES["START"])
             
             # Verify user was ensured to exist
-            mock_db.add_new_user_in_db.assert_called_once()
-            mock_db.update_date_for_user.assert_called_once()
+            mock_db.add_user.assert_called_once()
+            mock_db.update_user_date.assert_called_once()
 
 
 class TestBotSettings: