Fix tests in front-end modules

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: ~ [Archived] Frontend Infrastructure
• Labels: None
• Epic Link: fi-build-process-performance
• Sprint: S02E11 - The Big Lebowski
• QA Test Name:
  • LocalFile.FragmentsUI#AddFragmentToContentPage
  • LocalFile.PortalSmoke#Smoke
• QA Test Score: 10

After upgrading to Yarn you cannot run tests inside (many, all of?) our modules (`yarn test` throws an error).