docs: Update Vertex AI provider auth methods

[SannidhyaSah]

Added Information on how to use Service Account Keys to authenticate when setting up with google Vertex Provider

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Important

Update docs/providers/vertex.md to include Service Account Key authentication for Vertex AI provider.

• Authentication Methods:
  • Added instructions for using Service Account Keys as an alternative authentication method in docs/providers/vertex.md.
  • Users can paste JSON content or provide a file path for the Service Account Key.
• Configuration Steps:
  • Updated configuration steps to include Service Account Key options in docs/providers/vertex.md.

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Important

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1. docs/providers/vertex.md:50

• Draft comment:
  Good update for enhanced authentication instructions. Consider advising users to handle the Service Account JSON securely (e.g., avoid pasting in unsecured environments and ensure proper access controls).
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 30% <= threshold 50% The comment suggests a security best practice regarding handling sensitive information, which aligns with the rule about using environment variables securely. However, it doesn't directly suggest a code change or improvement, which is what the rules prioritize. The comment is more of a general advice rather than a specific actionable item.

2. docs/providers/vertex.md:53

• Draft comment:
  Clarify what happens if both Google Cloud Credentials and Google Cloud Key File Path fields are provided. Ensure users know which method takes precedence.
• Reason this comment was not posted:
  Decided after close inspection that this draft comment was likely wrong and/or not actionable: usefulness confidence = 20% vs. threshold = 50% The documentation presents these as distinct options (A and B) but doesn't explicitly state they are mutually exclusive or what happens if both are provided. However, this is a documentation edge case that most users won't encounter since they'll likely choose one method. The comment is asking for clarification about an implementation detail that isn't critical for most users. The comment raises a valid technical point about potential ambiguity in authentication configuration. Unclear behavior could lead to security or authentication issues. While technically valid, this is an edge case that users are unlikely to encounter in practice since the documentation clearly presents these as alternative options. The format "Option A" and "Option B" implies they are choices, not to be used together. The comment should be deleted as it addresses an edge case that most users won't encounter, and the current documentation structure already implies these are alternative options.

3. docs/providers/vertex.md:19

• Draft comment:
  Great addition of the Service Account Key auth details. Consider adding a brief note that emphasizes the need to securely handle and store the Service Account JSON key since it contains sensitive credentials.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% The comment suggests adding a note about securely handling and storing sensitive credentials. This is a suggestion for documentation or comments, which is not allowed by the rules. The rules emphasize not making purely informative comments or asking for documentation updates.

4. docs/providers/vertex.md:48

• Draft comment:
  The reorganization of the authentication setup is clear. It might be helpful to remind users that if they paste their JSON key content, they should ensure it is kept secure and not exposed inadvertently.
• Reason this comment was not posted:
  Comment did not seem useful. Confidence is useful = 0% <= threshold 50% This comment is purely informative and does not provide a specific code suggestion or request for clarification. It reminds users to keep their JSON key content secure, which is a general best practice but not directly actionable in the context of a code review.

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