gitlab-ci: Add sleep for every `scheduler.jobs.logs` call

Add a time.sleep call between proxy.scheduler.jobs.logs calls, since
they do not block. This will relieve some request pressure on LAVA
dispatchers.

Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <mesa/mesa!12797>
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