Clean up AssertJ usage after migration

- Avoid the use of assertThat(Arrays.equals(...))
- Convert assertThat(Boolean.FALSE).isEqualTo(x) to assertThat(x).isEqualTo(Boolean.FALSE)
- Convert assertThat(Boolean.TRUE).isEqualTo(x) to assertThat(x).isEqualTo(Boolean.TRUE)
- Convert assertThat(x.equals(y)).isTrue() to assertThat(x).isEqualTo(y)
- Convert assertThat(x.equals(y)).isFalse() to assertThat(x).isNotEqualTo(y)
- Remove unnecessary parentheses in assertThat() arguments
- Convert assertThat(x instanceof X).isFalse() to assertThat(x).isNotInstanceOf()
- Convert assertThat(x instanceof X).isTrue() to assertThat(x).isInstanceOf()
- Convert assertThat(!x).isTrue() to assertThat(x).isFalse()
- Inline conditions in assertThat() statements

Closes gh-36504

(cherry picked from commit e1e4d52b61)

spring-orm/src/test/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBeanTests.java

@@ -56,7 +56,7 @@ public abstract class AbstractEntityManagerFactoryBeanTests {
 	protected void checkInvariants(AbstractEntityManagerFactoryBean emfb) {
 		assertThat(EntityManagerFactory.class.isAssignableFrom(emfb.getObjectType())).isTrue();
 		EntityManagerFactory emf = emfb.getObject();
-		assertThat(emf instanceof EntityManagerFactoryInfo).as("Object created by factory implements EntityManagerFactoryInfo").isTrue();
+		assertThat(emf).as("Object created by factory implements EntityManagerFactoryInfo").isInstanceOf(EntityManagerFactoryInfo.class);
 		EntityManagerFactoryInfo emfi = (EntityManagerFactoryInfo) emf;
 		assertThat(emfb.getObject()).as("Successive invocations of getObject() return same object").isSameAs(emfi);
 		assertThat(emfb.getObject()).isSameAs(emfi);