partner: Update Upstage Model Names and Remove Deprecated Model

[inahjeon]

This PR updates model names in the upstage library to reflect the latest naming conventions and removes deprecated models.

Changes:

Renamed Models:

• solar-1-mini-chat -> solar-mini
• solar-1-mini-embedding-query -> embedding-query

Removed Deprecated Models:

• layout-analysis (replaced to document-parse)

Reference:

• https://console.upstage.ai/docs/getting-started/overview
• https://github.com/langchain-ai/langchain-upstage/releases/tag/libs%2Fupstage%2Fv0.5.0

Additional guidelines:

• Make sure optional dependencies are imported within a function.
• Please do not add dependencies to pyproject.toml files (even optional ones) unless they are required for unit tests.
• Most PRs should not touch more than one package.
• Changes should be backwards compatible.
• If you are adding something to community, do not re-import it in langchain.

If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

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