Remove Hibernate 5.2 smoke test to prepare for EE 9 upgrade

Closes gh-28826

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hibernate52/build.gradle

@@ -1,22 +0,0 @@
-plugins {
-	id "java"
-	id "org.springframework.boot.conventions"
-}
-
-description = "Spring Boot Hibernate 5.2 smoke test"
-
-configurations.all {
-	resolutionStrategy {
-		force "org.hibernate:hibernate-core:5.2.17.Final"
-	}
-}
-
-dependencies {
-	implementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-data-jpa")) {
-		exclude group: "org.hibernate.javax.persistence", module: "hibernate-jpa-2.1-api"
-	}
-
-	runtimeOnly("com.h2database:h2")
-
-	testImplementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-test"))
-}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hibernate52/src/main/java/org/springframework/boot/tests/hibernate52/Hibernate52Application.java

@@ -1,29 +0,0 @@
-/*
- * Copyright 2012-2019 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.tests.hibernate52;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class Hibernate52Application {
-
-	public static void main(String[] args) {
-		SpringApplication.run(Hibernate52Application.class, args);
-	}
-
-}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hibernate52/src/main/resources/application.properties

@@ -1 +0,0 @@
-spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hibernate52/src/test/java/org/springframework/boot/tests/hibernate52/Hibernate52ApplicationTests.java

@@ -1,30 +0,0 @@
-/*
- * Copyright 2012-2019 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.tests.hibernate52;
-
-import org.junit.jupiter.api.Test;
-
-import org.springframework.boot.test.context.SpringBootTest;
-
-@SpringBootTest
-class Hibernate52ApplicationTests {
-
-	@Test
-	void contextLoads() {
-	}
-
-}