[Fix]: $HOME in launcher eagle example (#1365)

### What does this PR do?

Type of change: Bug fix <!-- Use one of the following: Bug fix, new
feature, new example, new tests, documentation. -->

<!-- Details about the change. -->

Launcher example bug raised by @cjluo-nv 

Before fix: task1 in
tools/launcher/examples/Qwen/Qwen3-8B/hf_online_eagle3.yaml fails
Reason: due to `HOME: /tmp` set in container, enroot credentials in
`$HOME/.config/enroot/.crendential` not found
```
GpuFreq=control_disabled
pyxis: importing docker image: nvcr.io/nvidia/tensorrt-llm/release:1.3.0rc10
Apr 28 13:35:59.491365 2515157 slurmstepd   0x155552c3b780: error: pyxis: child 2515158 failed with error code: 1
Apr 28 13:35:59.491415 2515157 slurmstepd   0x155552c3b780: error: pyxis: failed to import docker image
Apr 28 13:35:59.491433 2515157 slurmstepd   0x155552c3b780: error: pyxis: printing enroot log file:
Apr 28 13:35:59.491453 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [INFO] Querying registry for permission grant
Apr 28 13:35:59.491469 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [INFO] Authenticating with user: <anonymous>
Apr 28 13:35:59.491483 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [INFO] Authentication succeeded
Apr 28 13:35:59.491499 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [INFO] Fetching image manifest list
Apr 28 13:35:59.491512 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [INFO] Fetching image manifest
Apr 28 13:35:59.491524 2515157 slurmstepd   0x155552c3b780: error: pyxis:     [ERROR] URL https://registry-1.docker.io/v2/nvcr.io/nvidia/tensorrt-llm/release/manifests/1.3.0rc10 returned error code: 401 Unauthorized
Apr 28 13:35:59.491564 2515157 slurmstepd   0x155552c3b780: error: pyxis: couldn't start container
Apr 28 13:35:59.491579 2515157 slurmstepd   0x155552c3b780: error: spank: required plugin spank_pyxis.so: task_init() failed with rc=-1
Apr 28 13:35:59.491593 2515157 slurmstepd   0x155552c3b780: error: Failed to invoke spank plugin stack
Apr 28 13:35:59.515523 2515146 slurmstepd   0x155552c3b780: error: pyxis: child 2515240 failed with error code: 1
```

After fix:
```
GpuFreq=control_disabled
pyxis: importing docker image: nvcr.io/nvidia/tensorrt-llm/release:1.3.0rc10
pyxis: imported docker image: nvcr.io/nvidia/tensorrt-llm/release:1.3.0rc10
```

### Usage

```python
# Add a code snippet demonstrating how to use this
```

### Testing
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### Before your PR is "*Ready for review*"

Make sure you read and follow [Contributor
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and your commits are signed (`git commit -s -S`).

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### Additional Information
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Updated example pipeline to use the standardized dataset example path.
* Removed unnecessary per-task overrides of the process home and cache
directory to simplify environment setup.
* Preserved required model checkpoint environment setting for the
relevant task so model resolution continues to work.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: h-guo18 <67671475+h-guo18@users.noreply.github.com>

Author: h-guo18

tools/launcher/examples/Qwen/Qwen3-8B/hf_online_eagle3.yaml

@@ -24,7 +24,7 @@ pipeline:
   task_0:
     script: common/eagle3/make_dataset.sh
     args:
-      - -f modules/Model-Optimizer/examples/speculative_decoding/prepare_input_conversations/example_data_config.yaml
+      - -f modules/Model-Optimizer/examples/dataset/example_data_config.yaml
       - --full-conversations
     slurm_config:
       _factory_: "slurm_factory"
@@ -44,9 +44,6 @@ pipeline:
       - training.disable_tqdm=true
       - training.ar_validate_steps=500000
       - training.num_train_epochs=1
-    environment:
-      - HOME: /tmp
-      - TORCHINDUCTOR_CACHE_DIR: /tmp/torch_cache
     slurm_config:
       _factory_: "slurm_factory"
       nodes: 1
@@ -68,8 +65,6 @@ pipeline:
       - --concurrency 1
     environment:
       - HF_MODEL_CKPT: <<global_vars.hf_model>>
-      - HOME: /tmp
-      - TORCHINDUCTOR_CACHE_DIR: /tmp/torch_cache
     slurm_config:
       _factory_: "slurm_factory"
       nodes: 1