Correctly infer Vertex AI base URL for location 'global' (#2014)

[lukeramsden]

Closes #2014

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Important

Fixes base URL inference for Vertex AI 'global' location in vertex_client.rs and updates documentation in vertex.mdx.

• Behavior:
  • Corrects base URL inference for Vertex AI when location is 'global' in vertex_client.rs.
  • Uses aiplatform.googleapis.com instead of {location}-aiplatform.googleapis.com for 'global'.
• Documentation:
  • Updates vertex.mdx to document the base URL format for 'global' location.

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1. engine/baml-runtime/src/internal/llm_client/primitive/vertex/vertex_client.rs:222

• Draft comment:
  Handles 'global' location correctly by using the special domain. Consider normalizing the case of the location if there's any chance of mismatched casing.
• Reason this comment was not posted:
  Comment was on unchanged code.

2. fern/03-reference/baml/clients/providers/vertex.mdx:120

• Draft comment:
  Documentation now accurately reflects the global endpoint URL. Ensure future changes in code are mirrored here.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% This comment is asking the PR author to ensure future changes are mirrored in the documentation, which is a form of asking them to double-check or ensure something. This violates the rule against asking the author to ensure behavior is intended or to double-check things.

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