Fix startup w/ seed_db

[Weves]

Description

The DB was not getting initialized before calling seed_db -> failures on startup if you had env-variable based seeding enabled.

Fixes https://linear.app/danswer/issue/DAN-1784/fix-seed-db-failures

How Has This Been Tested?

Tested locally w/ env-variable based seeding.

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 8, 2025 6:44pm

[greptile-apps]

PR Summary

The changes ensure that the database is properly initialized before invoking seed_db to prevent startup failures when seeding is enabled.

• Updated /backend/ee/onyx/main.py (EE) to wrap the base lifespan in an async context that calls seed_db after DB initialization.
• Removed the redundant seed_db call to avoid race conditions.
• Modified /backend/onyx/main.py (base) to accept an optional lifespan_override for flexible initialization.

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