Fix issues with evaluate at endpoint

[ebwinters]

Description

I ran into the following issues running the Evaluate at Endpoint notebook

1. Jinja template path was not being picked up
2. Running evaluate was giving

   GenerateFlowMetaJsonError: Generate meta failed, detail error:
   ["Parse interface for 'ask_wiki' failed: The return annotation of the entry function must be dataclass, TypedDict or string, but got typing.Dict[str, str]."]

Checklist

• [x] I have read the contribution guidelines
• [x] I have coordinated with the docs team (mldocs@microsoft.com) if this PR deletes files or changes any file names or file extensions.
• [x] This notebook or file is added to the CODEOWNERS file, pointing to the author or the author's team.