refactor: remove Conda support from Llama Stack (#2969)

# What does this PR do?
<!-- Provide a short summary of what this PR does and why. Link to
relevant issues if applicable. -->
This PR is responsible for removal of Conda support in Llama Stack

<!-- If resolving an issue, uncomment and update the line below -->
<!-- Closes #[issue-number] -->
Closes #2539

## Test Plan
<!-- Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.* -->

llama_stack/templates/nvidia/build.yaml

@@ -23,8 +23,7 @@ distribution_spec:
     - provider_type: inline::basic
     tool_runtime:
     - provider_type: inline::rag-runtime
-image_type: conda
-image_name: nvidia
+image_type: venv
 additional_pip_packages:
 - aiosqlite
 - sqlalchemy[asyncio]

llama_stack/templates/nvidia/doc_template.md

@@ -105,7 +105,7 @@ curl -X DELETE "$NEMO_URL/v1/deployment/model-deployments/meta/llama-3.1-8b-inst
 
 ## Running Llama Stack with NVIDIA
 
-You can do this via Conda or venv (build code), or Docker which has a pre-built image.
+You can do this via venv (build code), or Docker which has a pre-built image.
 
 ### Via Docker
 
@@ -124,17 +124,6 @@ docker run \
   --env NVIDIA_API_KEY=$NVIDIA_API_KEY
 ```
 
-### Via Conda
-
-```bash
-INFERENCE_MODEL=meta-llama/Llama-3.1-8b-Instruct
-llama stack build --template nvidia --image-type conda
-llama stack run ./run.yaml \
-  --port 8321 \
-  --env NVIDIA_API_KEY=$NVIDIA_API_KEY \
-  --env INFERENCE_MODEL=$INFERENCE_MODEL
-```
-
 ### Via venv
 
 If you've set up your local development environment, you can also build the image using your local virtual environment.