Use new JSX transform in all sample and test suites

Author: wojtekmaj

test/LocaleOptions.tsx

@@ -1,4 +1,4 @@
-import React, { useRef } from 'react';
+import { useRef } from 'react';
 
 type LocaleOptionsProps = {
   locale: string | undefined;

test/Test.tsx

@@ -1,4 +1,4 @@
-import React, { useRef, useState } from 'react';
+import { useRef, useState } from 'react';
 import DateTimePicker from 'react-datetime-picker';
 import 'react-datetime-picker/dist/DateTimePicker.css';
 import 'react-calendar/dist/Calendar.css';

test/index.tsx

@@ -1,4 +1,4 @@
-import React, { StrictMode } from 'react';
+import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 
 import Test from './Test.js';