CI Event design doc proposal follow-up

This issue is a follow-up from !125106 (closed)

TODOs;

Combine all proposals into a single one in the main design doc. This mostly means that accept Proposal 5 but explain why we did choose A over B. See !125106 (comment 1535808265)
From this thread, discuss how Compliance Framework pipelines will work with CI Events.
From this thread, discuss the syntax of job selection; on vs rules:if.
From thread1 and thread2, discuss how components will work with events.
From this thread we need to describe how important is to prevent abuse and protect the system reliability through the use of limits and rate-limits.

Edited Sep 19, 2023 by Fabio Pitino