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.

helper_bot/server_prometheus.py

@@ -29,7 +29,7 @@ class MetricsServer:
     async def metrics_handler(self, request: web.Request) -> web.Response:
         """Handle /metrics endpoint for Prometheus scraping."""
         try:
-            self.logger.info("Generating metrics...")
+            self.logger.debug("Generating metrics...")
             
             # Проверяем, что metrics доступен
             if not metrics:
@@ -40,9 +40,8 @@ class MetricsServer:
                 )
             
             # Генерируем метрики в формате Prometheus
-            self.logger.info("Calling metrics.get_metrics()...")
             metrics_data = metrics.get_metrics()
-            self.logger.info(f"Generated metrics: {len(metrics_data)} bytes")
+            self.logger.debug(f"Generated metrics: {len(metrics_data)} bytes")
             
             return web.Response(
                 body=metrics_data,