Fix Sentry ENV Name

[xrhythmic]

Why:

Aligning Github Documentation with Sentry to avoid confusion and failures.

Closes: #39071

What's being changed (if available, include any code snippets, screenshots, or gifs):

Aligning Github Documentation with Sentry: https://docs.sentry.io/product/sentry-mcp/

Code Change:

- "SENTRY_AUTH_TOKEN": "COPILOT_MCP_SENTRY_AUTH_TOKEN"
+ "SENTRY_ACCESS_TOKEN": "COPILOT_MCP_SENTRY_ACCESS_TOKEN"

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[Copilot]

Pull Request Overview

This PR updates the example environment variable used for Sentry in the Copilot MCP agent docs, changing from an auth token to an access token to align with Sentry’s documentation.

• Swapped the SENTRY_AUTH_TOKEN key for SENTRY_ACCESS_TOKEN.
• Updated the corresponding secret name from COPILOT_MCP_SENTRY_AUTH_TOKEN to COPILOT_MCP_SENTRY_ACCESS_TOKEN.

Comments suppressed due to low confidence (1)

content/copilot/how-tos/agents/copilot-coding-agent/extending-copilot-coding-agent-with-mcp.md:120

• Consider updating any preceding descriptive text or comments to replace references to SENTRY_AUTH_TOKEN with SENTRY_ACCESS_TOKEN, ensuring consistency throughout the documentation example.

        "SENTRY_ACCESS_TOKEN": "COPILOT_MCP_SENTRY_ACCESS_TOKEN"

[github-actions]

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Source	Review	Production	What Changed
copilot/how-tos/agents/copilot-coding-agent/extending-copilot-coding-agent-with-mcp.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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