Add ruby to contributions.debuggers.languages

[connor4312]

We've adjusted the flow for suggesting language debuggers. Now, when a user F5's without a launch config on a file for which there is no extension installed, we show a dialog like this: microsoft/vscode#119110 (comment)

The Ruby extension should add ruby to contributions.debuggers.languages to tell VS Code that it's a valid debugger for this language and avoid that popup for users that have the extension installed.

[github-actions]

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[connor4312]

Still relevant