Cleanup method name from 'timeouted?'

Formerly titled Follow-up from "WIP: MVC of SLI Alerts"

Description

There was a note left over from an MR about changing the name of a method from timeouted? to timed_out? but it hasn't been acted on. There is one place where we define the method and one place where we call it. We want to change both of those to timed_out?.

Historical context

The following discussion from !5163 (closed) should be addressed:

• @smcgivern started a discussion: (+2 comments)

  timed_out? 🙂