chore: update to paragon 19.0.0

Adapt to the big <Card> redesign.

Also, as part of 19.0.0, the shadow variables in paragon got
marked as !default, letting the theme override them. This would
normally be fine and good. But the edx.org theme has a dramatically
larger shadow set. And a lot of our cards and card-like components
were designed with a smaller shadow in mind. So I added a new
raised-card custom css class to keep as many cards looking the same.

Notably, I cannot fix the data tables on the Progress tab. So those
might have a larger shadow with this change, but that's unavoidable
and presumably the intent of the edx.org theme authors.

package.json

@@ -36,7 +36,7 @@
     "@edx/frontend-enterprise-utils": "1.1.1",
     "@edx/frontend-lib-special-exams": "1.15.5",
     "@edx/frontend-platform": "1.14.3",
-    "@edx/paragon": "17.1.2",
+    "@edx/paragon": "19.0.0",
     "@edx/frontend-component-header": "^2.4.2",
     "@fortawesome/fontawesome-svg-core": "1.2.36",
     "@fortawesome/free-brands-svg-icons": "5.15.4",