[FIX] N+1 Query in import_configs

[arumes31]

This PR addresses a performance issue in the restore_config endpoint where each configuration in the uploaded JSON was triggering a separate database query.

Changes:

• Implemented pre-fetching of all WebhookConfig objects using an IN query.
• Use a dictionary mapping for O(1) lookups during the restore process.
• Added a Redis mock to tests/conftest.py to ensure tests run reliably in environments without a live Redis server.
• Added tests/test_restore_config.py to verify the functionality and prevent regressions.

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PR created automatically by Jules for task 4708098699992627916 started by @arumes31

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