libcamera: camera: Ensure queued requests are invalidHEADmaster

Invalid, or not correctly reset requests can cause undefined behaviour
in the pipeline handlers due to unexpected request state.

If the status has not been reset to Request::RequestPending, it is
either not new, or has not been correctly procesed through
Request::reuse().

This can be caught early by validating the status of the request when it
is queued to a camera.

Reject invalid requests before processing them in the pipeline handlers.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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