Add mendix module mock and update jest config

- Add __mocks__/mendix.js mock for the mendix root module
- Map ^mendix$ in moduleNameMapper to the new mock
- Reformat jest.config.js to 2-space indentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: samuelreichert

packages/pluggable-widgets-tools/test-config/__mocks__/mendix.js

@@ -0,0 +1,7 @@
+"use strict";
+const ValueStatus = {
+  Available: "available",
+  Unavailable: "unavailable",
+  Loading: "loading",
+};
+module.exports = { ValueStatus };

packages/pluggable-widgets-tools/test-config/jest.config.js

@@ -24,6 +24,7 @@ module.exports = {
     },
     moduleNameMapper: {
         "\\.(css|less|scss|sass)$": "identity-obj-proxy",
+        "^mendix$": join(__dirname, "__mocks__/mendix"),
         "mendix/components/web/Icon": join(__dirname, "__mocks__/WebIcon"),
         "mendix/filters/builders": join(__dirname, "__mocks__/FilterBuilders"),
         "\\.png$": join(__dirname, "assetsTransformer.js"),