Revert "FEATURE: Introduce theme/component QUnit tests (#12517)" (#12632)

This reverts commit https://github.com/discourse/discourse/commit/a53d8d3e61d33dde22628a8ceb94b6a27cb0a99a and https://github.com/discourse/discourse/commit/105634435fe605f122e4a0a4a4293cc37a6747c6.

Reverted because the change broke some components. Will be added back in a few days.

spec/requests/theme_javascripts_controller_spec.rb

@@ -54,24 +54,4 @@ describe ThemeJavascriptsController do
       end
     end
   end
-
-  describe "#show_tests" do
-    context "theme settings" do
-      let(:component) { Fabricate(:theme, component: true, name: 'enabled-component') }
-
-      it "forces default values" do
-        ThemeField.create!(
-          theme: component,
-          target_id: Theme.targets[:settings],
-          name: "yaml",
-          value: "num_setting: 5"
-        )
-        component.reload
-        component.update_setting(:num_setting, 643)
-
-        get "/theme-javascripts/tests/#{component.id}.js"
-        expect(response.body).to include("require(\"discourse/lib/theme-settings-store\").registerSettings(#{component.id}, {\"num_setting\":5}, { force: true });")
-      end
-    end
-  end
 end