feat: add ponyfills to support multipart requests on android webview versions < 50 and iOS versions < 13.2

test/mocks/File.mock.js

@@ -4,9 +4,14 @@ module.exports = class FileMock extends BlobMock {
   constructor(blob, fileName) {
     super(blob, { type: blob.type });
     this._fileName = fileName || '';
+    this.__lastModifiedDate = new Date();
   }
 
   get name() {
     return this._fileName;
   }
+
+  get lastModifiedDate() {
+    return this.__lastModifiedDate;
+  }
 }