Ability to choose a service account on linux

[jborozco]

Use case

To reproduce real attack environment, I want to be able to execute a custom payload through a non-system user.

After doing a POC and for a first MVP, we want to be able to define a Service Account (first on Linux) for the ability to:

-CRUD a Service account to be used for executing injects on endpoints as an admin
-Execute a payload with elevated privilege by default

[savacano28]

Scope: Paylaod custom, windows, openbas agent : https://www.notion.so/filigran/Ability-to-choose-non-system-user-to-execute-a-payload-91f0f341848e431895a8bfb463703082.
Prs:
Just include elevation_request:
Openbas: #1410
Collector: OpenBAS-Platform/collectors#41

Prs POC:
Openbas: #1396
Agent: OpenBAS-Platform/agent#14
Collector: OpenBAS-Platform/collectors#41