Add prefer-value-in-head option to count interpolated string as scalar
#1817
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I noticed in some rule I worked on that Regal didn't flag this, which was right given that interpolated strings aren't exactly scalar values. But I do want to have Regal recommend moving them to the head assignment when possible, while keeping the
only-scalarsoption set astrue. This PR adds a newinclude-interpolatedoption to allow this precisely, and makes it enabled in our own settings.