chore: remove leftover llama_stack directory (#3940)

# What does this PR do?

Followup on https://github.com/llamastack/llama-stack/pull/3920 where
the llama_stack directory was moved under src.

Signed-off-by: Sébastien Han <seb@redhat.com>

src/llama_stack/distributions/dell/run-with-safety.yaml

@@ -109,6 +109,9 @@ storage:
     conversations:
       table_name: openai_conversations
       backend: sql_default
+    prompts:
+      namespace: prompts
+      backend: kv_default
 registered_resources:
   models:
   - metadata: {}

src/llama_stack/distributions/meta-reference-gpu/run-with-safety.yaml

@@ -122,6 +122,9 @@ storage:
     conversations:
       table_name: openai_conversations
       backend: sql_default
+    prompts:
+      namespace: prompts
+      backend: kv_default
 registered_resources:
   models:
   - metadata: {}

src/llama_stack/distributions/nvidia/run-with-safety.yaml

@@ -111,6 +111,9 @@ storage:
     conversations:
       table_name: openai_conversations
       backend: sql_default
+    prompts:
+      namespace: prompts
+      backend: kv_default
 registered_resources:
   models:
   - metadata: {}