Refactoring the SMIGRATED flow - the notification is changed to contain the src node address for each slot range movement.

[petyaslavova]

Description of change

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[Copilot]

Pull request overview

This pull request refactors the SMIGRATED notification flow to include source node address information for each slot range movement. The key changes involve:

Changes:

• Modified OSSNodeMigratedNotification to use a list of NodesToSlotsMapping objects containing src_node_address, dest_node_address, and slots
• Updated notification parsing to handle the new SMIGRATED message format with triplets (src_node, dest_node, slots)
• Refactored OSSMaintNotificationsHandler to process notifications at cluster level without per-connection handler copies
• Added __hash__ methods to ClusterNode classes to support set operations
• Updated tests to reflect new notification format and behavior

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
redis/maint_notifications.py	Refactored notification handling to use src node information; removed per-connection handler copies; added NodesToSlotsMapping dataclass; increased SMIGRATED TTL from 30 to 120 seconds
redis/connection.py	Updated handler initialization to share OSS cluster handler across connections; added maintenance state reset in disconnect()
redis/_parsers/base.py	Updated SMIGRATED message parsing to extract src_node, dest_node, and slots triplets; added dual handler invocation
redis/cluster.py, redis/asyncio/cluster.py	Added hash methods to ClusterNode for set operations
tests/test_scenario/test_maint_notifications.py	Major test refactoring with new parametrized tests using fault injector effects and triggers
tests/test_scenario/fault_injector_client.py	Added get_slot_migrate_triggers method; fixed variable naming; updated send_notification calls
tests/test_scenario/conftest.py	Added module-level singleton for fault injector client
tests/maint_notifications/test_maint_notifications.py	Updated tests for new NodesToSlotsMapping structure
tests/maint_notifications/test_cluster_maint_notifications_handling.py	Updated tests for new SMIGRATED format with src node information
tests/maint_notifications/proxy_server_helpers.py	Changed send_notification to broadcast to all connections; updated RESP translation for triplets

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