update unit tests mocking

I realize some people love highly-mocked unit tests like these, but IMO they are an extremely poor value for effort. This whole are can only really be profitably tested in a more integration test pattern.

tests/integration/models/blueprint-test.js

@@ -1296,6 +1296,7 @@ describe('Blueprint', function () {
         taskNameLookedUp = name;
         return new AddonInstallTask();
       };
+      blueprint.project = { isEmberCLIProject() { return true } };
     });
 
     afterEach(async function () {