fix: Adding Embedding model to watsonx inference (#2118)

# What does this PR do?
Issue Link : https://github.com/meta-llama/llama-stack/issues/2117

## Test Plan
Once added, User will be able to use Sentence Transformer model
`all-MiniLM-L6-v2`

llama_stack/templates/dependencies.json

@@ -833,6 +833,8 @@
     "tqdm",
     "transformers",
     "tree_sitter",
-    "uvicorn"
+    "uvicorn",
+    "sentence-transformers --no-deps",
+    "torch torchvision --index-url https://download.pytorch.org/whl/cpu"
   ]
 }