AC-14420 - blacklisting underscore.js file as it is giving static failure

Author: del72683

dev/tests/static/testsuite/Magento/Test/Js/_files/blacklist/magento.txt

@@ -18,6 +18,7 @@ lib/web/prototype/**/*.js
 lib/web/jquery/jstree/jquery.jstree.js
 lib/web/jquery/colorpicker/js/colorpicker.js
 lib/web/chartjs/chartjs-adapter-moment.js
+lib/web/underscore.js:18
 
 // MINIFIED FILES
 app/code/**/*.min.js