Add catch to backOff in job log jump to failures

What does this MR do and why?

This MR adds a catch to a backOff that didn't have one to stop making unnecessary noise in sentry. It also adds a test that throws an error in this spot and expects it to be caught.

From this thread:

this should have a catch, as backoff is throws sentry errors otherwise

stumbled across here: https://new-sentry.gitlab.net/organizations/gitlab/issues/619/?project=4&query=is%3Aunresolved#exception

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

option 1:

1. git checkout add-catch-to-job-log-failure-backoff
2. yarn jest spec/frontend/jobs/components/job/job_log_controllers_spec.js

option 2:

1. git checkout add-catch-to-job-log-failure-backoff
2. echo "Feature.enable(:job_log_jump_to_failures)" | bundle exec rails console
3. enable sentry in gdk
4. throw an error inside the backOff
5. local sentry should not have received the error

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.