Hide excess key message (#476)

Before:

```python
Aug 23 23:51:31.394 [INFO] Loaded Maykeye/TinyLLama-v0 block 0, _IncompatibleKeys(missing_keys=[], unexpected_keys=['self_attn.rotary_emb.inv_freq'])
```

After:

```python
Aug 23 23:51:31.394 [INFO] Loaded Maykeye/TinyLLama-v0 block 0
```

Hiding this since the excess keys in Llama-based models are okay since the latest transformers release.

src/petals/server/from_pretrained.py

@@ -74,7 +74,8 @@ def load_pretrained_block(
             param = param.to(torch_dtype)
         set_module_tensor_to_device(block, param_name, "cpu", value=param, dtype=param.dtype)
 
-    logger.info(f"Loaded {model_name} block {block_index}, {report}")
+    logger.info(f"Loaded {model_name} block {block_index}")
+    logger.debug(f"Details: {report}")
     return block