Provide a default set of questions for the standalone RAG pipeline (#…

…1758)

* PR #1617 replaced the hard-coded questions with a command-line-flag, however it was not given a default value nor was it marked as a required flag.
* Set the original question as the default value for the flag

Requires #1755
Closes #1757


## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - David Gardner (https://github.com/dagardner-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: #1758

examples/llm/rag/run.py

@@ -80,6 +80,7 @@ def run():
     "--question",
     type=str,
     multiple=True,
+    default=["What are some new attacks discovered in the cyber security industry?"] * 5,
     help="The question to answer with the RAG pipeline. Specify multiple times to answer multiple questions at once.",
 )
 def pipeline(**kwargs):