fix: view_media_artifact error

[yzld2002]

https://landing938428.monday.com/boards/1922513007/pulses/1922526546

1. The view_media_artifact needs to load the media from observation first and then feed it to the LLM, so we need an local accessible media path (instead of the remote e2b path).
2. It's safer to load the artifact's files into local directory.

Tests:

1. View the result artifact:

• Prod error
  

• Local run with e2b backend

2. View the artifact first and then generate code

• Prod error

• Local run with e2b backend

[dillonalaird]

LGTM thanks!