Refactor Notebook Link Handling (#16473)

* add keep absolute paths instead convert setting

* update tests/config

* refactor links in NotebookLinkHandler

src/sql/workbench/contrib/notebook/browser/notebook.contribution.ts

@@ -335,6 +335,11 @@ configurationRegistry.registerConfiguration({
 			'default': 200,
 			'minimum': 10,
 			'description': localize('notebook.maxRichTextUndoHistory', "The maximum number of changes stored in the undo history for the notebook Rich Text editor.")
+		},
+		'notebook.useAbsoluteFilePaths': {
+			'type': 'boolean',
+			'default': false,
+			'description': localize('notebook.useAbsoluteFilePaths', "Use absolute file paths when linking to other notebooks.")
 		}
 	}
 });