libcamera: camera_manager: Stop exponential explosive calls to createPipelineHandlers

Currently the function `createPipelineHandlers` connects itself to the
`devicesAdded` signal at the end of each call. As the Signal object
supports multiple non-unique listeners connected to it, the former
function would be called exponentially often with each new emitted event
on `devicesAdded` (i.e. with udev plugging in a new camera)

Fix it by connecting the createPipelineHandlers() slot to `devicesAdded`
signal in CameraManager::Private::init() instead. This will prevent the
slot getting connected multiple times to the `devicesAdded` signal.

Signed-off-by: Sophie Friedrich <dev@flowerpot.me>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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