fix(tools/looker): address feedback for agent tool

[hiracky16]

Description

Addresses the feedback from the maintainers regarding the looker-agent tool.
ref: #2830

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🛠️ Fixes #<issue_number_goes_here>

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the looker-agent tool by addressing previous feedback, primarily focusing on enhancing its documentation. The changes provide a much clearer and more comprehensive guide for users on how to configure and utilize the tool, detailing its various operations and their respective parameters. This improves usability and reduces potential confusion for developers integrating the looker-agent.

Highlights

• Documentation Enhancement: The looker-agent tool's documentation has been significantly expanded to provide a clear, detailed description of its operations (list, get, create, delete) and the required parameters for each.
• Configuration Example Update: The YAML configuration example for the looker-agent tool in the documentation was updated to reflect a more standard tools: array structure and to incorporate the detailed parameter descriptions.
• Test Consistency: A test case for parsing YAML configurations for the looker-agent tool was updated to use the agent_manage name, ensuring consistency.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the looker-agent tool, providing a more detailed YAML configuration example with specific parameters for operations like listing, getting, creating, and deleting agents. It also removes a redundant reference table from the documentation and updates a test case to reflect the new tool name. However, the provided YAML configuration example in the documentation is incorrect as it uses a tools: list instead of the expected kind: tool top-level definition.