Update workflow triggers for Copilot setup

[brignano]

Remove pull_request trigger for copilot-setup-steps workflow.

Why:

Closes: #42379

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

This pull request makes a small change to the workflow trigger configuration, removing the pull_request trigger for the copilot-setup-steps.yml workflow. Now, the workflow will only be triggered on push events to the specified file.

Before

After

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.

[github-actions]

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Source	Review	Production	What Changed
copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment.md	fpt ghec	fpt ghec

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[Copilot]

Pull request overview

This pull request updates the workflow trigger configuration in the documentation for the copilot-setup-steps.yml workflow. The change removes the pull_request trigger, so the workflow will now only execute on push events to the workflow file itself and via manual workflow_dispatch.

Changes:

• Removed pull_request trigger configuration from the copilot-setup-steps workflow example

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[Copilot]

The comment on line 51 states "Automatically run the setup steps when they are changed to allow for easy validation" but with the removal of the pull_request trigger, validation will only happen after the changes are pushed to the branch (typically after merge), not during the pull request review process. Consider updating this comment to reflect that validation occurs on push events rather than during pull request review.