Updated migration support for Unraid integration and update versioning

[domalab]

This pull request includes significant changes to the Unraid custom component for Home Assistant, focusing on migration improvements and entity ID validation. The most important changes include adding migration support with rollback, updating the migration version, and modifying entity ID handling for consistency and validation.

Migration improvements:

• custom_components/unraid/__init__.py: Added async_migrate_with_rollback function to handle data migration with rollback support during the setup process. [1] [2]
• custom_components/unraid/config_flow.py: Updated the configuration flow to use the new migration version and added an async_migrate_entry method to handle migration of config entries. [1] [2]

Entity ID validation:

• custom_components/unraid/migrations.py: Refactored the clean_entity_id function to clean_and_validate_unique_id for better unique ID validation and added rollback functionality in case of migration failure. [1] [2]
• custom_components/unraid/naming.py: Updated the EntityNaming class to use the clean_and_validate_unique_id function for consistent entity ID generation.

Version updates:

• custom_components/unraid/const.py: Introduced MIGRATION_VERSION to track the migration version and ensure proper updates.

[domalab]

#60