feat(principles): Extend existing principles

What does this MR do?

This MR is an iterative update to address gitlab-org/gitlab-design#2551.

Why make this change? Though we have robust process principles, the principles that help guide our day-to-day experience decisions feel like they could be extended, in part to reflect some of the latest discussions around principles.

In an effort to further extend and document these principles I've suggested:

• Combining the existing "Productive" and "Minimal" principles.
• Extending the existing "Human" principle to clarify that empathy with users means supporting their larger goals/outcomes, which further encourages designers to have a "whole product" or "whole workflow" mentality. This is following the "be goal-driven over task-driven" AI product principle.
• Introducing the "be transparent over opaque" principle from the AI product principle discussions, as it seems applicable to the product more generally, too.

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