Ace editor warning in test suite

There is currently some acequire import issue in ace-builds when running the test suite, where the following are undefined in the test environment:

frontend/src/commons/editor/Editor.tsx

Line 673 in 00d49de

const defaultMode = acequire('ace/mode/javascript').Mode();

frontend/src/commons/editor/Editor.tsx

Line 445 in 00d49de

acequire('ace/ext/language_tools').setCompleters([

Thus, acequire is currently being mocked in the test suite in AssessmentWorkspace and Playground where the tests render the Ace editor. However, these mocks result in the following console warning as the actual Ace editor is not initialized properly:

TODO:
Let's debug the root cause and fix the acequire import issue