Update Copilot CLI installation command

[devm33]

Why:

Updates the CLI installation to use the latest prerelease

Closes:

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

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• 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.

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[Copilot]

Pull Request Overview

This PR updates the Copilot CLI installation command in the development container configuration to use the prerelease version and removes npm registry authentication setup.

Key Changes

• Simplified the Copilot CLI installation to use @github/copilot@prerelease
• Removed npm registry configuration and authentication token setup

[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions:

• .devcontainer/devcontainer.json

You'll need to revert all of the files you changed that match that list using GitHub Desktop or git checkout origin/main <file name>. Once you get those files reverted, we can continue with the review process.

The complete list of files we can't accept are:

• .devcontainer/**
• .github/**
• data/reusables/rai/**
• Dockerfile*
• src/**
• package*.json
• content/actions/how-tos/security-for-github-actions/security-hardening-your-deployments/**

We also can't accept contributions to files in the content directory with frontmatter type: rai or contentType: rai.

[github-actions]

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