Eric Lewis 207ba54fed In wp.Backbone.Subviews, extract subviews with proper Underscore.js functions.
Subviews are stored internally on the Subview manager as an object. The object 
is composed of key-value pairs where the key is a jQuery selector for a view,
and the value is an array of views that matching the selector.

To extract subviews, `_.flatten()` was used to collate the nested arrays of 
views into a single view. However, `_.flatten()` is not intended to be used 
for objects, and this unintended functionality breaks in newer versions of 
Underscore.js. 

Instead, we'll use `_.values()` to extract the arrays of views first, 
and then flatten the array of arrays.

Props adamsilverstein.
See #34350.

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