Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4317
This patch fixes a regression in
a35bf1e3847351703542869755b6b9e536b9d2fd.
The new calls to tracers in the affected change were being done while
holding the pad object lock, which wasn't the case in the old ones,
leading to the latency tracer deadlocking in gst_object_get_parent().
The dependency on the pad lock for those calls was accidental. This
patch removes it by temporarily unlocking during the affected calls,
not unlike how it's done when calling a probe callback or the
send_event() function of the downstream element.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8925>
371100c743