community[minor]: Add support for non-file-based Document Loaders in PebbloSafeLoader (#19574)

**Description:**
PebbloSafeLoader: Add support for non-file-based Document Loaders

This pull request enhances PebbloSafeLoader by introducing support for
several non-file-based Document Loaders. With this update,
PebbloSafeLoader now seamlessly integrates with the following loaders:
- GoogleDriveLoader
- SlackDirectoryLoader
- Unstructured EmailLoader

**Issue:** NA
**Dependencies:** - None
**Twitter handle:** @Raj__725

---------

Co-authored-by: Rahul Tripathi <rauhl.psit.ec@gmail.com>

libs/community/langchain_community/document_loaders/pebblo.py

@@ -125,7 +125,9 @@ class PebbloSafeLoader(BaseLoader):
         doc_content = [doc.dict() for doc in self.docs]
         docs = []
         for doc in doc_content:
-            doc_source_path = get_full_path(doc.get("metadata", {}).get("source"))
+            doc_source_path = get_full_path(
+                doc.get("metadata", {}).get("source", self.source_path)
+            )
             doc_source_owner = PebbloSafeLoader.get_file_owner_from_path(
                 doc_source_path
             )