chore: Add pyright configuration values to help it find the venv

[raunakab]

Description

This PR adds two values to the backend/pyproject.toml to help pyright find the path to the .venv file.

Addresses: https://linear.app/danswer/issue/DAN-1704/built-in-gemini-vertex-ai-support.

How Has This Been Tested?

pyright works. No further testing required.

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 7, 2025 7:46pm

[greptile-apps]

PR Summary

This PR updates backend/pyproject.toml by adding a new [tool.pyright] block and reformatting the [tool.ruff] configuration for consistency.

• Added [tool.pyright] with venvPath = "../.." and venv = ".venv" to help Pyright locate the virtual environment.
• Reformatted the [tool.ruff] 'select' array from multiline to inline.
• Ensure the ../.. path correctly reflects the actual project structure.

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[raunakab]

Closing since we're using pylsp with type-checking provided by the mypy plugin instead!