Add CoroutinesAnnotationTransactionInterceptorTests

suspendingValueSuccess() currently fails due to an
unexpected rollback on transactional suspending functions
returning a value.

See gh-25998

Author: sdeleuze

spring-tx/src/test/kotlin/org/springframework/transaction/annotation/CoroutinesAnnotationTransactionInterceptorTests.kt

@@ -22,24 +22,18 @@ import org.assertj.core.api.Assertions
 import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.Test
 import org.springframework.aop.framework.ProxyFactory
-import org.springframework.transaction.TransactionManager
 import org.springframework.transaction.interceptor.TransactionInterceptor
-import org.springframework.transaction.testfixture.CallCountingTransactionManager
 import org.springframework.transaction.testfixture.ReactiveCallCountingTransactionManager
 
 /**
  * @author Sebastien Deleuze
  */
 class CoroutinesAnnotationTransactionInterceptorTests {
 
-	private val ptm = CallCountingTransactionManager()
-
 	private val rtm = ReactiveCallCountingTransactionManager()
 
 	private val source = AnnotationTransactionAttributeSource()
 
-	private val ti = TransactionInterceptor((ptm as TransactionManager), source)
-
 	@Test
 	fun suspendingNoValueSuccess() {
 		val proxyFactory = ProxyFactory()