Detect bad imports in eslint

[c-w]

After merging this pull request, the eslint step in our CI pipeline will fail if there is any require call against a dependency that doesn't exist.

For example, this will protect us against the following types of problems:

const Promise = require('promse');
const eventHubSender = require('../eventhubClient/EventHubSemder');

Sample build that detected a bad import: Job#94.1.

[Smarker]

LGTM