Add Eclipse Update Site for the GitHub Copilot Eclipse plug-in

[thahnen]

Closes: 36411

Installing from the Eclipse Update Site is an alternative to the Eclipse Marketplace (that might not be available). Link to the official (and always latest) Eclipse documentation on how to do so.

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[Copilot]

PR Overview

This PR introduces an alternative installation method for the GitHub Copilot Eclipse plug-in by including the Eclipse Update Site as a source.

• Added the Eclipse Update Site URL alongside the Eclipse Marketplace option.
• Provided a direct link to the official Eclipse documentation for installation instructions.

Reviewed Changes

File	Description
content/copilot/managing-copilot/configure-personal-settings/installing-the-github-copilot-extension-in-your-environment.md	Added alternative installation method using the Eclipse Update Site

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

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Table of review links

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Source	Review	Production	What Changed
copilot/managing-copilot/configure-personal-settings/installing-the-github-copilot-extension-in-your-environment.md	fpt ghec	fpt ghec

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

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[subatoi]

Thanks for raising this, @thahnen! We'll review it as soon as we can

[subatoi]

Many thanks @thahnen and thanks for your patience! I just made some minor amendments based purely on style. I'll get this merged for you now ✨

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