Add support for ShellScript@2 task

[samsmithnz]

• 1 failure on 7-Jan-2021

Azure DevOps docs: https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/utility/shell-script?view=azure-devops

- task: ShellScript@2
  inputs:
    scriptPath:
    #args: '' # Optional
    #disableAutoCwd: false # Optional
    #cwd: '' # Optional
    #failOnStandardError: false