refactor: simplify jest config (#42136)

* refactor: bring api jest tests to root

* refactor: pull client tests to root

* fix: remove ancient curriculum babelrc

* feat: run all jest tests at once

* fix: remove unused babelrcRoot

* chore: remove more jests

jest.transform.js

@@ -0,0 +1,15 @@
+const babelOptions = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 14
+        }
+      }
+    ],
+    '@babel/react'
+  ]
+};
+
+module.exports = require('babel-jest').createTransformer(babelOptions);