gstreamer: Move negotiation logic to separate function

Move the code which negotiates all the source pad caps into a separate
function called gst_libcamera_src_negotiate(). When the negotiation
fails this function will return false and true otherwise.

Use this function instead of doing the negotiation manually in
gst_libcamera_src_task_enter() and remove the now redundant error
handling code accordingly.

Signed-off-by: Jaslo Ziska <jaslo@ziska.de>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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