pipewire: Fix GST hang for unavailable cameras

- GST pipeline or camera-gstreamer app hangs for a unavailable target.

- To fix the issue gstpipewiresrc element in pipewire is enhanced to
  handle the pw_stream error in a better manner.

Bug-AGL: SPEC-4881
Change-Id: Id67095b1ecf5e59d00f9c79e15c7464f27a43eb4
Signed-off-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29397
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Marius Vlad <marius.vlad@collabora.com>