core(network-dependency-tree-insight): add preconnect advice #16557
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Adds all the new preconnect advice to the net. dep tree insight audit.
I extended the List details item to accept "sections", so that we can provide additional titles / descriptions to parts of an audit.
site with no preconnects (https://paulirish.com/)
site with too many preconnects (cnn.com)