Parse RAI inner error message for display when using data

[sarah-widder]

Description

Modify the frontend error display code to parse inner errors (e.g. content filter errors) for the with data case.

Now it matches the without-data case:

Contribution Checklist

• [x] I have built and tested the code locally and in a deployed app
• [x] For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• [x] This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• [x] I didn't break any existing functionality :smile:

[sarah-widder]

Looks good to me! I would just check the build workflow to see why it's failing. I can reapprove after that.

Thanks @abhahn the build should be fixed now!

[abhahn]

Contains fix for #813