Moved options from ts-loader to the dedicated tsconfig.test file. [sk…

…ip ci]

tsconfig.test.json

@@ -3,6 +3,17 @@
  */
 {
   "extends": "./tsconfig.json",
+  "compilerOptions": {
+    // Do not emit any JS file as these TypeScript files are just passed through webpack.
+    // Automated tests have a single entry point.
+    // See: https://github.com/ckeditor/ckeditor5/issues/12111.
+    "noEmit": false,
+    // Do not emit any file when couldn't compile a TS file.
+    // Otherwise, karma prints an error on the top of the output log and then, execute tests.
+    // It might give a false positive results. Tests are OK while something could not be compiled.
+    // In such a case we would like to throw an error.
+    "noEmitOnError": false
+  },
   "include": [
     "./typings/",
     "./packages/*/src/augmentation.ts",