test(data-loader): move jest.setTimeout to top of the file (#1024)

* test: move `jest.setTimeout` to top of the file

ref. jestjs/jest#11500

* chore: extend timeout to 30 sec

src/__tests__/main.test.ts

@@ -10,9 +10,7 @@ const mainFilePath = path.resolve(
   packageJson.bin["kintone-data-loader"]
 );
 
-beforeEach(() => {
-  jest.setTimeout(10000);
-});
+jest.setTimeout(30000);
 
 const checkRejectArg = ({
   arg,