Currently the update_traces_checksum script prints a label verification
request with a line that is 167 characters long.
Split the long line to make it more readable. Update the flake8
configuration to enforce a maximum line length of 159 characters to ensure
consistency.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32602>
Now you don't fail if you're trying to test a mesa/mesa MR pipeline and
gitlab takes more than 10s to create it. And you don't have to wait 10
seconds to get things started (aka see if your regex was right) if you're
testing a user/mesa fork pipeline.
Fixes: 941d92408e ("bin/ci_run_n_monitor: automatically pick MR pipelines when they exist")
Closes: #9894
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25810>
