SNOW-1926267: Fix promise rejecting for file upload errors

Author: sfc-gh-pmotacki

lib/connection/statement.js

@@ -842,18 +842,19 @@ function FileStatementPreExec(
 async function executeFileTransferRequest(context, body, statement, fileTransferAgent) {
   context.fileMetadata = body;
 
-  const fta = typeof fileTransferAgent === 'undefined' ? new FileTransferAgent(context) : fileTransferAgent;
-  await fta.execute();
+  const fta = fileTransferAgent ?? new FileTransferAgent(context);   await fta.execute();
 
   try {
     // build a result from the response
     const result = fta.result();
 
     // init result and meta
-    body.data.rowset = result.rowset;
-    body.data.returned = body.data.rowset.length;
-    body.data.rowtype = result.rowtype;
-    body.data.parameters = [];
+    body.data = {
+      rowset: result.rowset,
+      returned: body.data.rowset.length,
+      rowtype: result.rowtype,
+      parameters: [],
+    };
 
     context.result = new Result({
       response: body,

lib/file_transfer_agent/file_transfer_agent.js

@@ -216,7 +216,7 @@ function FileTransferAgent(context) {
           if (meta['resultStatus'] === 'ERROR') {
             errorDetails = meta['errorDetails'];
             if (!errorDetails) {
-              errorDetails = `Unknown error during PUT of file: ${meta['srcFilePath'].toString()}`;
+              errorDetails = `Unknown error during PUT of file: ${meta['srcFilePath']}`;
             }
             throw new Error(errorDetails);
           }
@@ -234,8 +234,8 @@ function FileTransferAgent(context) {
 
           errorDetails = meta['errorDetails'];
 
-          srcFileSize = meta['srcFileSize'].toString();
-          dstFileSize = meta['dstFileSize'].toString();
+          srcFileSize = meta['srcFileSize'];
+          dstFileSize = meta['dstFileSize'];
 
           rowset.push([
             meta['srcFileName'],