[WEB-4720] chore: refactor and extend cleanup tasks for logs and versions (#7604)

* Refactor and extend cleanup tasks for logs and versions

- Consolidate API log deletion into cleanup_task.py - Add tasks to
delete old email logs, page versions, and issue description versions -
Update Celery schedule and imports for new tasks

* chore: update cleanup task with mongo changes

* fix: update log deletion task name for clarity

* fix: enhance MongoDB archival error handling in cleanup task

- Added a parameter to check MongoDB availability in the flush_to_mongo_and_delete function.
- Implemented error logging for MongoDB archival failures.
- Updated calls to flush_to_mongo_and_delete to include the new parameter.

* fix: correct parameter name in cleanup task function call

- Updated the parameter name from 'mode' to 'model' in the process_cleanup_task function to ensure consistency and clarity in the code.

* fix: improve MongoDB connection parameter handling in MongoConnection class

- Replaced direct access to settings with getattr for MONGO_DB_URL and MONGO_DB_DATABASE to enhance robustness.
- Added warning logging for missing MongoDB connection parameters.

apps/api/plane/settings/mongo.py

@@ -0,0 +1,121 @@
+# Django imports
+from django.conf import settings
+import logging
+
+# Third party imports
+from pymongo import MongoClient
+from pymongo.database import Database
+from pymongo.collection import Collection
+from typing import Optional, TypeVar, Type
+
+
+T = TypeVar("T", bound="MongoConnection")
+
+# Set up logger
+logger = logging.getLogger("plane.mongo")
+
+
+class MongoConnection:
+    """
+    A singleton class that manages MongoDB connections.
+
+    This class ensures only one MongoDB connection is maintained throughout the application.
+    It provides methods to access the MongoDB client, database, and collections.
+
+    Attributes:
+        _instance (Optional[MongoConnection]): The singleton instance of this class
+        _client (Optional[MongoClient]): The MongoDB client instance
+        _db (Optional[Database]): The MongoDB database instance
+    """
+
+    _instance: Optional["MongoConnection"] = None
+    _client: Optional[MongoClient] = None
+    _db: Optional[Database] = None
+
+    def __new__(cls: Type[T]) -> T:
+        """
+        Creates a new instance of MongoConnection if one doesn't exist.
+
+        Returns:
+            MongoConnection: The singleton instance
+        """
+        if cls._instance is None:
+            cls._instance = super(MongoConnection, cls).__new__(cls)
+            try:
+                mongo_url = getattr(settings, "MONGO_DB_URL", None)
+                mongo_db_database = getattr(settings, "MONGO_DB_DATABASE", None)
+
+                if not mongo_url or not mongo_db_database:
+                    logger.warning(
+                        "MongoDB connection parameters not configured. MongoDB functionality will be disabled."
+                    )
+                    return cls._instance
+
+                cls._client = MongoClient(mongo_url)
+                cls._db = cls._client[mongo_db_database]
+
+                # Test the connection
+                cls._client.server_info()
+                logger.info("MongoDB connection established successfully")
+            except Exception as e:
+                logger.warning(
+                    f"Failed to initialize MongoDB connection: {str(e)}. MongoDB functionality will be disabled."
+                )
+        return cls._instance
+
+    @classmethod
+    def get_client(cls) -> Optional[MongoClient]:
+        """
+        Returns the MongoDB client instance.
+
+        Returns:
+            Optional[MongoClient]: The MongoDB client instance or None if not configured
+        """
+        if cls._client is None:
+            cls._instance = cls()
+        return cls._client
+
+    @classmethod
+    def get_db(cls) -> Optional[Database]:
+        """
+        Returns the MongoDB database instance.
+
+        Returns:
+            Optional[Database]: The MongoDB database instance or None if not configured
+        """
+        if cls._db is None:
+            cls._instance = cls()
+        return cls._db
+
+    @classmethod
+    def get_collection(cls, collection_name: str) -> Optional[Collection]:
+        """
+        Returns a MongoDB collection by name.
+
+        Args:
+            collection_name (str): The name of the collection to retrieve
+
+        Returns:
+            Optional[Collection]: The MongoDB collection instance or None if not configured
+        """
+        try:
+            db = cls.get_db()
+            if db is None:
+                logger.warning(
+                    f"Cannot access collection '{collection_name}': MongoDB not configured"
+                )
+                return None
+            return db[collection_name]
+        except Exception as e:
+            logger.warning(f"Failed to access collection '{collection_name}': {str(e)}")
+            return None
+
+    @classmethod
+    def is_configured(cls) -> bool:
+        """
+        Check if MongoDB is properly configured and connected.
+
+        Returns:
+            bool: True if MongoDB is configured and connected, False otherwise
+        """
+        return cls._client is not None and cls._db is not None