Fix tests rendering UndeclaredThrowableException instead of InvalidDataAccessApiUsageException

[IlyaMuravjov]

Description

When exception was thrown by any Repository method then RepositoryWrapperInvocationHandler was causing it to get wrapped into InvocationTargetException, leading to tests with comments rendering incorrect stack trace:

@Test
@DisplayName("createOrder: order = null -> throw UndeclaredThrowableException")
public void testCreateOrderThrowsUTE() {
    OrderService orderService = ((OrderService) applicationContext.getBean("orderService"));
    
    /* This test fails because method [com.rest.order.services.OrderService.createOrder] produces [java.lang.reflect.UndeclaredThrowableException]
        com.sun.proxy.$Proxy147.save(Unknown Source)
        com.rest.order.services.OrderService.createOrder(OrderService.java:52) */
    orderService.createOrder(null);
}

How to test

Manual tests

Generate tests for spring-boot-testing-main, failed tests should render correct stack trace like this one:

@Test
@DisplayName("createOrder: order = null -> throw InvalidDataAccessApiUsageException")
public void testCreateOrderThrowsIDAAUE1() {
    OrderService orderService = ((OrderService) applicationContext.getBean("orderService"));
    
    /* This test fails because method [com.rest.order.services.OrderService.createOrder] produces [org.springframework.dao.InvalidDataAccessApiUsageException: Entity must not be null.; nested exception is java.lang.IllegalArgumentException: Entity must not be null.]
        org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:374)
        org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:235)
        org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:551)
        org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:61)
        org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:242)
        org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:152)
        org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174)
        org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
        org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
        com.sun.proxy.$Proxy147.save(Unknown Source)
        jdk.internal.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
        java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        java.base/java.lang.reflect.Method.invoke(Method.java:566)
        org.utbot.spring.repositoryWrapper.RepositoryWrapperInvocationHandler.invoke(RepositoryWrapperInvocationHandler.kt:15)
        com.sun.proxy.$Proxy147.save(Unknown Source)
        com.rest.order.services.OrderService.createOrder(OrderService.java:52) */
    orderService.createOrder(null);
}

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.