Add 3.3 70B to Ollama inference provider (#681)

# What does this PR do?

Adds 3.3 70B support to Ollama inference provider

## Test Plan

<details>
<summary>Manual</summary>

```bash
# 42GB to download
ollama pull llama3.3:70b

ollama run llama3.3:70b --keepalive 60m

export LLAMA_STACK_PORT=5000
pip install -e . \
  && llama stack build --template ollama --image-type conda \
  && llama stack run ./distributions/ollama/run.yaml \
  --port $LLAMA_STACK_PORT \
  --env INFERENCE_MODEL=Llama3.3-70B-Instruct \
  --env OLLAMA_URL=http://localhost:11434

export LLAMA_STACK_PORT=5000
llama-stack-client --endpoint http://localhost:$LLAMA_STACK_PORT \
  inference chat-completion \
  --model-id Llama3.3-70B-Instruct \
  --message "hello, what model are you?"
```

<img width="1221" alt="image"
src="https://github.com/user-attachments/assets/dcffbdd9-94c8-4d47-9f95-4ef6c3756294"
/>

</details>

## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Ran pre-commit to handle lint / formatting issues.
- [x] 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/ollama/ollama.py

@@ -100,6 +100,10 @@ model_aliases = [
         "llama3.2-vision:90b",
         CoreModelId.llama3_2_90b_vision_instruct.value,
     ),
+    build_model_alias(
+        "llama3.3:70b",
+        CoreModelId.llama3_3_70b_instruct.value,
+    ),
     # The Llama Guard models don't have their full fp16 versions
     # so we are going to alias their default version to the canonical SKU
     build_model_alias(