♻️(backend) refactor dedupe_accounts command

[kernicPanel]

Purpose

Refactored dedupe_accounts to improve readability
and logic separation by moving duplicate-handling logic to a utility.

[Copilot]

Pull Request Overview

This PR refactors the dedupe_accounts management command to improve code organization and maintainability by extracting the deduplication logic into dedicated utility classes (UserDeduplicator and DedupeTracker).

Key Changes

• Extracted deduplication logic from the management command into a new UserDeduplicator class with separate methods for each type of transfer operation
• Created a DedupeTracker class to centralize tracking of deduplication operations and results
• Added comprehensive test coverage for the new utility classes with 689 lines of tests for UserDeduplicator and 439 lines for DedupeTracker

Reviewed Changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
user_deduplicator.py	New utility class implementing user deduplication logic with methods for transferring various resources between duplicate accounts
dedupe_tracker.py	New utility class for tracking deduplication operations and logging results
__init__.py (dedupe_accounts)	Provides a simple dedupe_accounts function interface to the UserDeduplicator
dedupe_accounts.py (command)	Simplified management command that now delegates to the utility function
test_user_deduplicator.py	Comprehensive test suite for the UserDeduplicator class
test_dedupe_tracker.py	Comprehensive test suite for the DedupeTracker class
test_dedupe_accounts_command.py	Updated command tests adapted to new implementation
test_social_pipeline_social_auth.py	Added new test case for email association functionality

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