Feat: use filepath for files with the same name for all data source types (#11819)

### What problem does this PR solve?

When there are multiple files with the same name the file would just
duplicate, making it hard to distinguish between the different files.
Now if there are multiple files with the same name, they will be named
after their folder path in the storage unit.

This was done for the webdav connector and with this PR also for Notion,
Confluence and S3 Storage.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Contribution by RAGcon GmbH, visit us [here](https://www.ragcon.ai/)

common/data_source/models.py

@@ -180,6 +180,7 @@ class NotionPage(BaseModel):
     archived: bool
     properties: dict[str, Any]
     url: str
+    parent: Optional[dict[str, Any]] = None  # Parent reference for path reconstruction
     database_name: Optional[str] = None  # Only applicable to database type pages