Add tabbed navigation and a list of all debug layers with the ability to interactively select or hide them.

This pull request includes code to add the functionality described on the corresponding ticket.

• Create tabbed navigation that is sticky at the top, so users can easily switch from Selected to List.
• Create a List tab that grants access to the corresponding list of elements.
• Create a list of all the template elements on the page with corresponding checkboxes for selecting and hiding.
• Create hover events that will clarify which is the corresponding page element for the hovered list item, and vice-versa (hovering a debug layer on the screen should visually highlight the corresponding list element).

Closes #3453313

assigned to @mabho

merged