feat: Add ability to specify vertex-ai model location

[raunakab]

Description

This PR enables the ability to specify the location of the vertex-ai model location.

Addresses: https://linear.app/danswer/issue/DAN-2148/add-ability-to-specify-vertex-ai-model-location.

Screenshot

How Has This Been Tested?

Manually tested.

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 11, 2025 6:09pm

[greptile-apps]

PR Summary

Adds support for specifying Google Cloud Vertex AI model locations, enabling more flexible deployment configurations across different GCP regions.

• Added new VERTEX_LOCATION_KWARG in backend/onyx/llm/chat_llm.py to support custom GCP region specification
• Renamed VERTEX_CREDENTIALS_KWARG to VERTEX_CREDENTIALS_FILE_KWARG in backend/onyx/llm/chat_llm.py for better clarity
• Extracted key_type into separate CustomConfigKeyType type alias in web/src/app/admin/configuration/llm/interfaces.ts for improved code reuse
• Reorganized model kwargs handling in backend/onyx/llm/chat_llm.py to cleanly process both credentials and location parameters

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