Is your feature request related to a problem? Please describe.
While working on Human-in-the-Loop interruption and confirmation with our Pipeline Breakpoint feature in deepset-ai/haystack-experimental#369, I encountered some pain points.

It would be convenient if BreakpointException returned the snapshot as an attribute, similar to the recent addition in PipelineRuntimeError. Additionally, having the full file path including the file name of the saved snapshot would help, as we currently auto-generate the file name and it's not easy to determine from just the directory path.

Describe the solution you'd like
Add snapshot and full_snapshot_file_path attributes to BreakpointException to make it easier for users to locate and work with the snapshot.

Additional context
I suggest full_snapshot_file_path since snapshot_file_path in Breakpoint currently only contains the directory path. The full_ prefix clarifies that this includes both the directory path and the file name.