Builder Plugin Hook not present for Add Potential Link

[bjeffries]

Describe the bug The Builder Plugin only works when using an adversary that uses the atomic planner, and does not work when adding a potential link.

This occurs because the Builder Plugin Hook uses the executor.HOOKS dictionary, which is only checked in planning_svc.py (_generate_new_links). This function is only called by the atomic planner and is never reached when using Add Potential Links.

I will be submitting a PR that address this bug and proposes a better way to approach these hooks in a more flexible manner.

To Reproduce Steps to reproduce the behavior:

1. Start Caldera with Builder plugin enabled.
2. Add a potential link with a Caldera ability that leverages the Builder plugin.

Expected behavior The Builder plugin ability should work no matter how it is executed (Add Potential Link or Adversary with Planner).

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Ubuntu
• Browser: Firefox
• Version Caldera v4.2 and Caldera v5

Additional context Add any other context about the problem here.