SD3 latents error 'tuple' object has no attribute 'to' issue on stable_diffusion_3/pipeline_stable_diffusion_3.py

script to produce:

```
image = pipe(prompt="", negative_prompt="", guidance_scale=1.,
num_inference_steps=20, latents=inv_latents)
```

inv_latents value print:
```

(tensor([[[[-0.8428, -0.8203, -0.8325, ..., -0.8325, -0.8706, -0.8521],
[-0.8511, -0.7632, -0.8467, ..., -0.8008, -0.8745, -0.7905],
[-0.8369, -0.8174, -0.8281, ..., -0.8462, -0.8765, -0.8521],
...,
[-0.8110, -0.7686, -0.8145, ..., -0.7793, -0.8638, -0.7783],
[-0.8770, -0.8442, -0.8525, ..., -0.8672, -0.8745, -0.8862],
[-0.8252, -0.7676, -0.8247, ..., -0.7769, -0.8599, -0.7729]],

[[ 0.2629, 0.2347, 0.2681, ..., 0.2496, 0.2795, 0.2344],
[ 0.2366, 0.1709, 0.2303, ..., 0.1785, 0.2410, 0.1726],
[ 0.2622, 0.2383, 0.2644, ..., 0.2512, 0.2844, 0.2454],
...,
[ 0.2448, 0.1589, 0.2306, ..., 0.1731, 0.2385, 0.1768],
[ 0.2634, 0.2157, 0.2786, ..., 0.2510, 0.2832, 0.2466],
[ 0.2473, 0.1547, 0.2256, ..., 0.1705, 0.2375, 0.1667]],

[[-0.4492, -0.3923, -0.4451, ..., -0.3835, -0.4512, -0.3704],
[-0.5542, -0.5742, -0.5522, ..., -0.5449, -0.5347, -0.5562],
[-0.4590, -0.3870, -0.4697, ..., -0.3794, -0.4258, -0.3694],
...,
[-0.5405, -0.5596, -0.5337, ..., -0.5293, -0.5293, -0.5337],
[-0.4358, -0.3608, -0.4524, ..., -0.3442, -0.4343, -0.3508],
[-0.5317, -0.5728, -0.5352, ..., -0.5469, -0.5273, -0.5386]],

...,

[[ 1.6729, 1.7832, 1.6689, ..., 1.7676, 1.6572, 1.7568],
[ 1.8535, 1.8691, 1.8604, ..., 1.8613, 1.8760, 1.8320],
[ 1.6816, 1.7891, 1.6729, ..., 1.7812, 1.6787, 1.7559],
...,
[ 1.8281, 1.8496, 1.8311, ..., 1.8311, 1.8359, 1.8086],
[ 1.6758, 1.7832, 1.6523, ..., 1.7500, 1.6406, 1.7402],
[ 1.8066, 1.8389, 1.8398, ..., 1.8281, 1.8359, 1.8008]],

[[ 1.6436, 1.6270, 1.6504, ..., 1.6289, 1.6533, 1.6240],
[ 1.7275, 1.6943, 1.7227, ..., 1.6904, 1.7334, 1.6826],
[ 1.6406, 1.6191, 1.6465, ..., 1.6240, 1.6553, 1.6162],
...,
[ 1.7012, 1.6816, 1.7080, ..., 1.6553, 1.7100, 1.6465],
[ 1.6611, 1.6299, 1.6641, ..., 1.6289, 1.6572, 1.6367],
[ 1.7070, 1.6729, 1.7031, ..., 1.6494, 1.7197, 1.6436]],

[[ 1.5859, 1.5527, 1.5752, ..., 1.5586, 1.5547, 1.5557],
[ 1.5332, 1.6621, 1.5391, ..., 1.6641, 1.4902, 1.6748],
[ 1.5674, 1.5596, 1.5684, ..., 1.5479, 1.5439, 1.5547],
...,
[ 1.5156, 1.6367, 1.5176, ..., 1.6611, 1.4619, 1.6660],
[ 1.5566, 1.5576, 1.5693, ..., 1.5518, 1.5439, 1.5420],
[ 1.5137, 1.6328, 1.5205, ..., 1.6514, 1.4697, 1.6602]]]],
device='cuda:0', dtype=torch.float16),)

```

Start in stable_diffusion_3/pipeline_stable_diffusion_3.py and reproduce the reported call with the provided latents value. Trace how the pipeline handles latents and confirm that the call no longer raises the reported tuple attribute error.

Scritto dal modello di indicizzazione a partire dal testo della issue.