Add setting to toggle Project Outline View

### Brief Issue Summary

We have received customer feedback that some users prefer to prior Project Outline View.

This item is to track a setting users can toggle if they want to revert to this prior experience.

### CMake Tools Diagnostics

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### Debug Log

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### Additional Information

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Start by locating the current Project Outline View implementation and any existing settings that control project views. Confirm how the prior experience differs from the current one, then define the setting behavior so users can toggle between them; done when the setting reliably restores the prior view.

Written by the indexing model from the issue text.