Is there an existing issue for this?

• I have searched the existing issues

Problem statement

#1462 implements a dependency graph for local files, but since @ericvergnaud does not yet have access to DB infra, only unit tests have been implemented.
There is a need to implement LocalFileLoader and LocalNotebookLoader, and create proper integration tests.

Proposed Solution

Omplement LocalFileLoader and LocalNotebookLoader, and create proper integration tests.

Additional Context

No response