Revamp FE build enforcer guideline Runbooks with clear pipeline incident creation criteria

Issue Summary

As part of the PIR ACTION ITEM, we need to revamp the FE build enforcer runbooks with clear guideline about when to create pipeline incidents. To make sure we treat pipeline incident with the right priority.

Steps to Reproduce

N/A

Expected Results

FE pipeline breaking for 1d, then Sev3, 2d then sev2.

Actual Results

2d sev2

Workaround

N/A