chore(telemetry): updated opt-in attributes to internal

[poshinchen]

Description

Set include_tool_definitions to internal only.

Why making this change

As discussed in the thread, we wouldn't want users to adjust include_tool_definitions directly but setting the environment variables properly. Therefore adding the suffix _ and will update the documentation.

Related Issues

#1083

Documentation PR

TBD

Type of Change

• Chore update
• Breaking change

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[pgrayy]

Can you add the reason for these changes to the PR description.