🤖 Refactor Database Initialization for Celery Workers

[sentry-autofix]

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This fix was triggered by Rohan Agarwal

Fixes SEER-9P

This pull request introduces changes to the database initialization process for Flask applications, specifically for scenarios where Celery workers are involved. The init_celery_app function in app.py has been updated to include a new parameter skip_db_init, which, when set, skips the database initialization step during bootup. In the initialize_database function within db.py, a global variable _db_initialized is introduced to track whether the database has already been initialized, preventing redundant initialization attempts. Additionally, the bootup function now checks for an application context before invoking initialize_database, ensuring appropriate context management in worker environments.

If you have any questions or feedback for the Sentry team about this fix, please email autofix@sentry.io with the Run ID: 2255.