Added missing classNames on global-styles ToolsPanels

[0verscore]

What?

This PR introduces classNames for the border, dimensions, and background ToolsPanel components located in packages/block-editor/src/components/global-styles

Why?

A unique selector is required to eg. embed a portal within these components. The necessary classes have already been implemented and are also in use within block components.

Impact?

These changes will not result in any visible differences in the interface. If needed, I can further refine the classNames for better differentiation in the global-styles context.

Let me know if you’d like additional adjustments!

Before	After

[github-actions]

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