refactor: simplify jest config (freeCodeCamp#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

Author: ojeytonwilliams

api-server/.babelrc

@@ -0,0 +1,16 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {"targets": {
+        "node": 10
+      }}
+    ]
+  ],
+  "plugins": [
+    "babel-plugin-transform-function-bind",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-object-rest-spread",
+    "@babel/plugin-proposal-optional-chaining"
+  ]
+}