tests:ges: Take TIMEOUT_FACTOR into account
This env var is set in the CI so we grow the timeout as required (when running in valgrind for example).
See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/jobs/15449209
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This env var is set in the CI so we grow the timeout as required (when running in valgrind for example).
See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/jobs/15449209