Backdoor user is not deleted afterwards

[ilija-lazoroski]

Describe the bug

When using the post breach action Backdoor user, the user created it is not deleted afterwards which causes the PBA to fail.

To Reproduce

Steps to reproduce the behavior:

1. Run Monkey Island
2. Configure to run just Backdoor user PBA
3. Run the monkey agents manually

Expected behavior

The user should be deleted after the post breach action finishes.

Screenshots

Machine version (please complete the following information):

• OS: Windows and Linux (victims)

Tasks

• Remove BackdoorUser PBA and change CommunicateAsNewUser to something else. (0d) @ilija-lazoroski
  • In the agent.
  • In the island.
• Fix Swimm with respect to above changes. (0d) - @shreyamalviya
• Don't use hardcoded password for CommunicateAsNewUser. See Create user PBA needs random password #1169. (0d) - @shreyamalviya
• Add unit test for AutoNewWindowsUser. (0d) @ilija-lazoroski, @shreyamalviya