Update Jest to 25.4

At the time of writing, CRA uses Jest 24 and React Testing Library.
This adds the latest version of Jest for us to use instead of using
react-scripts.

Update Github workflow to use Jest instead of react-script.
Add Babel Runtime and Transform Runtime Plugin to handle async
calls in our tests.

Author: angelocordon

.babelrc.json

@@ -1,3 +1,4 @@
 {
-  "presets": ["@babel/preset-env", "@babel/preset-react"]
+  "presets": ["@babel/preset-env", "@babel/preset-react"],
+  "plugins": ["@babel/plugin-transform-runtime"]
 }

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
         run: npm install
 
       - name: Running Jest Tests
-        run: CI=true npm test
+        run: npm test --ci
 
       - name: Running ESLint
         run: npm run lint