DEV: Disallow Ember global usage (#16147)

…and sprinkle `// eslint-disable-next-line no-undef` throughout the code where is unavoidable for now

lib/javascripts/widget-hbs-compiler.js

@@ -281,6 +281,7 @@ class Compiler {
   }
 }
 
+// eslint-disable-next-line no-undef
 const loader = typeof Ember !== "undefined" ? Ember.__loader.require : require;
 
 function compile(template, glimmer) {
@@ -363,6 +364,7 @@ const WidgetHbsCompiler = function (babel) {
             compile(template, WidgetHbsCompiler.glimmer)
           );
         } catch (e) {
+          // eslint-disable-next-line no-console
           console.error("widget hbs error", e.toString());
           return error(path, state, e.toString());
         }