Default `management.cloudfoundry.enabled` to true

Update `CloudFoundryActuatorAutoConfiguration` so that it is enabled
when `management.cloudfoundry.enabled` is missing.

See gh-7108

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/cloudfoundry/CloudFoundryActuatorAutoConfiguration.java

@@ -45,7 +45,7 @@ import org.springframework.web.servlet.HandlerInterceptor;
  * @since 1.5.0
  */
 @Configuration
-@ConditionalOnProperty(prefix = "management.cloudfoundry", name = "enabled", matchIfMissing = false)
+@ConditionalOnProperty(prefix = "management.cloudfoundry", name = "enabled", matchIfMissing = true)
 @ConditionalOnBean(MvcEndpoints.class)
 @AutoConfigureAfter(EndpointWebMvcAutoConfiguration.class)
 @ConditionalOnCloudPlatform(CloudPlatform.CLOUD_FOUNDRY)

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/cloudfoundry/CloudFoundryActuatorAutoConfigurationTests.java

@@ -110,7 +110,6 @@ public class CloudFoundryActuatorAutoConfigurationTests {
 	public void cloudFoundryPlatformActiveAndCloudControllerUrlNotPresent()
 			throws Exception {
 		EnvironmentTestUtils.addEnvironment(this.context, "VCAP_APPLICATION:---",
-				"management.cloudfoundry.enabled:true",
 				"vcap.application.application_id:my-app-id");
 		this.context.refresh();
 		CloudFoundryEndpointHandlerMapping handlerMapping1 = this.context.getBean(
@@ -126,7 +125,6 @@ public class CloudFoundryActuatorAutoConfigurationTests {
 
 	private CloudFoundryEndpointHandlerMapping x() {
 		EnvironmentTestUtils.addEnvironment(this.context, "VCAP_APPLICATION:---",
-				"management.cloudfoundry.enabled:true",
 				"vcap.application.application_id:my-app-id",
 				"vcap.application.cf_api:http://my-cloud-controller.com");
 		this.context.refresh();