Design: Unify tree navigation designs across products

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Context

There are several areas of GitLab that use tree navigation in addition to traditional navigation as a list. Tree navigation allows users to maintain context while navigating nested directories with several layers. It is standard in code development tools.

However, tree navigation elements currently appear differently across 3 different GitLab products. While we should prioritize what's best for users in specific workflows, there may be an opportunity to unify the designs a bit more for design system consistency.

Source Code > Repository	Merge request > Changes tab	Security Inventory
Currently in development &17781	Example	Example

Design proposal

TBD