dev/sg: trim out buildkite log line prefix in stdout
Created by: bobheadxi
I don't know how, but there's a magic character in here somewhere that hides log lines from actual commands run in a job when using sg ci logs
. Adds a regex to strip out this weird buildkite prefix when sg ci logs
outputs to stdout.
Closes https://github.com/sourcegraph/sourcegraph/discussions/26059 , more details there