test: gstreamer: Check availability of cameras before running

Move the logic for checking the availability of cameras from
multi_stream_test to gstreamer test base class. Since
single_stream_class always assumes that a camera is available on the
system (which is not always the case for e.g. RPi in CI/CD environments)
it makes sense to have the availability check in the base class.
If no cameras are available, the behaviour should be to skip instead
of a failure.

We currently have 2 tests for gstreamer differing based on number
of streams supported by the camera. Hence, the camera availability
is checked in conjunction with the number of the streams required by
the derived class.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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