test(compiler-cli): fix TEST_CASES.json schema (#39939)

The schema accidentally included the `expectedErrors` and `extraCheck`
properties below the `files` property instead of below the `expectations`
property.

PR Close #39939

packages/compiler-cli/test/compliance/test_cases/test_case_schema.json

@@ -73,6 +73,7 @@
                         "title": "A path (relative to the test case) where an file containing expected output can be found. (The generated path is inferred from this.)"
                       }
                     ]
+                  }
                 },
                 "expectedErrors": {
                   "title": "A collection of expected error messages for this test-case.",
@@ -135,5 +136,4 @@
       "minItems": 1
     }
   }
-  }
 }