Some recurrent messages are only cluttering the ci_run_n_monitor's logs,
so let's use the easily provided @cache decorator to print stuff that
the user will only needs to see once.
Also removes some junk that can happen during the pipeline monitoring
loop, like the "----" line break, and newlines.
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30361>
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