Merge branch '474146-truncate-based-on-characters-not-just-lines' into 'master'

Troubleshoot job: Truncate logs based on characters

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/160457



Merged-by: Max Fan <mfan@gitlab.com>
Approved-by: Max Fan <mfan@gitlab.com>
Approved-by: Jessie Young <jessieyoung@gitlab.com>
Co-authored-by: Allison Browne <abrowne@gitlab.com>