vscode.Uri.joinPath instead of Node's path.join

Fixes https://github.com/microsoft/vscode-internalbacklog/issues/1280

extensions/search-result/src/extension.ts

@@ -134,7 +134,7 @@ function relativePathToUri(path: string, resultsUri: vscode.Uri): vscode.Uri | u
 	}
 
 	const uriFromFolderWithPath = (folder: vscode.WorkspaceFolder, path: string): vscode.Uri =>
-		folder.uri.with({ path: pathUtils.join(folder.uri.fsPath, path) });
+		vscode.Uri.joinPath(folder.uri, path);
 
 	if (vscode.workspace.workspaceFolders) {
 		const multiRootFormattedPath = /^(.*) • (.*)$/.exec(path);