fix llama stack build for together & llama stack build from templates (#479)

# What does this PR do?

- Fix issue w/ llama stack build using together template
<img width="669" alt="image"
src="https://github.com/user-attachments/assets/1cbef052-d902-40b9-98f8-37efb494d117">

- For builds from templates, copy over the
`templates/<template-name>/run.yaml` file to the
`~/.llama/distributions/<name>/<name>-run.yaml` instead of re-building
run config.


## Test Plan

```
$ llama stack build --template together --image-type conda
..
Build spec configuration saved at /opt/anaconda3/envs/llamastack-together/together-build.yaml
Build Successful! Next steps:
   1. Set the environment variables: LLAMASTACK_PORT, TOGETHER_API_KEY
   2. `llama stack run /Users/xiyan/.llama/distributions/llamastack-together/together-run.yaml`
```

```
$ llama stack run /Users/xiyan/.llama/distributions/llamastack-together/together-run.yaml
```

```
$ llama-stack-client models list
$ pytest -v -s -m remote agents/test_agents.py --env REMOTE_STACK_URL=http://localhost:5000 --inference-model meta-llama/Meta-Llama-3.1-8B-Instruct-Turbo
```
<img width="764" alt="image"
src="https://github.com/user-attachments/assets/b805b6c5-a316-4561-8fe3-24fc3b1f8b80">


## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

llama_stack/providers/remote/inference/together/config.py

@@ -22,7 +22,7 @@ class TogetherImplConfig(BaseModel):
     )
 
     @classmethod
-    def sample_run_config(cls) -> Dict[str, Any]:
+    def sample_run_config(cls, **kwargs) -> Dict[str, Any]:
         return {
             "url": "https://api.together.xyz/v1",
             "api_key": "${env.TOGETHER_API_KEY}",