feat: close rooms in delete queue and sector endpoints

[MarcusviniciusLsantos]

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• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)
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What

Add support for the end_all_chats query parameter on the DELETE endpoints for Sector (DELETE /api/v1/sector/{uuid}/) and Queue (DELETE /api/v1/queue/{uuid}/). When ?end_all_chats=true is provided, all active rooms (both ongoing with an assigned agent and waiting without an agent) are closed in batches before the sector/queue is deleted. The implementation reuses the existing BulkCloseService, preserving all business logic (tags, pins, InService status, CSAT, WebSocket notifications, metrics, and queue priority routing).

Key behaviors:

• Flag absent or false: existing behavior is unchanged.
• Flag true, no active rooms: deletion proceeds normally.
• Flag true, all rooms closed successfully: deletion proceeds.
• Flag true, partial failure: logs a warning and proceeds with deletion.
• Flag true, all rooms failed to close: returns 400 and aborts deletion.

Files changed:

• chats/apps/api/v1/sectors/viewsets.py — added _close_active_rooms and updated perform_destroy
• chats/apps/api/v1/queues/viewsets.py — added _close_active_rooms and updated perform_destroy
• chats/apps/sectors/tests/test_viewsets.py — added SectorEndAllChatsTests (6 test cases)
• chats/apps/queues/tests/test_viewsets.py — added QueueEndAllChatsTests (6 test cases)

Why

When a sector or queue is deleted, any active rooms associated with it remain open in a broken state — they reference a queue/sector that no longer exists, which can lead to inconsistent data and a poor user experience. By allowing the caller to pass end_all_chats=true, the API ensures all conversations are properly closed (with notifications, metrics, and CSAT flows triggered) before the resource is removed, maintaining data integrity and a clean shutdown of ongoing chats.