Migrate rest of test suite from JUnit 4 to JUnit Jupiter

This commit migrates the rest of Spring's test suite to JUnit Jupiter,
except spring-test which will be migrated in a separate commit.

See gh-23451

spring-test/src/test/java/org/springframework/test/context/jdbc/PopulatedSchemaDatabaseConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -43,7 +43,7 @@ public class PopulatedSchemaDatabaseConfig {
 	@Bean
 	public DataSource dataSource() {
 		return new EmbeddedDatabaseBuilder()//
-		.setName("populated-sql-scripts-test-db")//
+		.generateUniqueName(true)
 		.addScript("classpath:/org/springframework/test/context/jdbc/schema.sql") //
 		.build();
 	}