libtest: camera_test: Plumb constructor to set LIBCAMERA_IPA_FORCE_ISOLATION

Some tests might require to have LIBCAMERA_IPA_FORCE_ISOLATION set
to ensure they can test the IPA running in isolated mode. These tests
are likely to leverage CameraTest. The environment variable should
be set before CameraManager::start() call which happens in CameraTest's
constructor. Hence, plumb the constructor with a flag so that the
LIBCAMERA_IPA_FORCE_ISOLATION can be set before CameraManager::start().

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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