Added an item with github source authentication to the dotnet CLI in the instructions for GitHub Packages

[Falcion]

Why:

The article itself, although contains information on how to authenticate github source for NuGet integration with GitHub Packages still indicate GitHub Actions in the title, which can confuse a user who is working with GitHub Packages for the first time and is trying to upload their project manually (again using dotnet CLI)

Example of this experience is this discussion: https://github.com/orgs/community/discussions/49186

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

Update guide in Publishing a package and Publishing a package using a nuget.config file and add step about authenticating GitHub Packages for user:

1. Authentificate GitHub Packages with the `dotnet` command-line interface (CLI). Replace `OWNER` with your username or company name.

    ```shell
    dotnet nuget add source --username OWNER --password ${ secrets.GITHUB_TOKEN } --store-password-in-clear-text --name github "https://nuget.pkg.github.com/OWNER/index.json"
    ```

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[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

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Source	Preview	Production	What Changed
packages/working-with-a-github-packages-registry/working-with-the-nuget-registry.md	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9

---

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

[nguyenalex836]

@Falcion Thanks so much for opening a PR! I'll get this triaged for review ✨

[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[thyeggman]

This step already exists in the "Authenticating to GitHub Packages" section of the documentation, although it is formatted for use in a GitHub Actions workflow. I think the confusion is understandable, though.

I would suggest removing these two changes and moving the new part up to the above section. Use YOUR_GITHUB_PAT to match other examples instead of ${{ secrets.GITHUB_TOKEN }}. Mention that it is a command that can be run directly from the command line using the dotnet CLI instead of manually configuring a nuget.config file. Also check the spelling of "Authenticate" 👍

[Falcion]

I apologize for the "spammy" commits with fixes and adjustments to your answer.

As was mentioned in the discussion, I removed the “duplicate” authorizations, changed ${{ secrets.GITHUB_TOKEN }} to YOUR_GITHUB_PAT, combined and moved the authorization instructions to the “Publish a package” block, if something else required, I'll be happy to try to fix/finish it.

[nguyenalex836]

@Falcion Thank you so much for that last batch of adjustments! 💛 I'll update the branch and get this merged once tests are passing 🍏

[github-actions]

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