Add skipLibCheck to the application tests

5443048 introduced this to all the other configs, but it needs to
be in the app fixture as well so that the same issue flagged up
there does not blow up during the Ember build.

Author: chriskrycho

Diff for: test-fixtures/skeleton-app/tsconfig.json

@@ -10,7 +10,17 @@
       "skeleton-app/*": [
         "app/*"
       ]
-    }
+    },
+    // We *really* don't want this on, but our hand is forced somewhat at the
+    // moment: the types for `console-ui` are correct for consuming `inquirer`
+    // in the pre-Node16 world, but don't interoperate correctly when consumed
+    // by a CJS-default package in the TS Node16+ world *and* consume an ESM
+    // package. Our path forward there is to update `console-ui` to publish a
+    // dual-mode package with types and runtime code to support it.
+    //
+    // NOTE TO READERS: this is *only* required because of a very specific bit
+    // of weird wiring in our test harness; it will *not* affect normal apps.
+    "skipLibCheck": true
   },
   "include": [
     "app"