Revert "Add *.snk strong name key files"

[Youssef1313]

Reasons for making this change

This reverts #2483 per discussion in there.

Links to documentation supporting these rule changes

https://learn.microsoft.com/dotnet/standard/library-guidance/strong-naming

✔️ CONSIDER adding the strong naming key pair (public + private) to your source control system.

Merge and Approval Steps

• Confirm that you've read the contribution guidelines and ensured your PR aligns
• Ensure CI is passing
• Get a review and Approval from one of the maintainers

[Copilot]

Pull request overview

This PR reverts a previous change (PR #2483) that added a commented-out rule for *.snk (strong name key) files in the VisualStudio gitignore template. The revert aligns with Microsoft's official guidance that recommends adding strong naming key pairs to source control. The change cleanly removes the 4-line comment block that warned against including strong name files.

• Removes the commented-out #*.snk rule and its explanatory comment
• Aligns with Microsoft's strong naming guidance for .NET libraries

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