Fix Javadoc @Since checkstle violations

Apply consistent `@Since` tags and retrofit the existing code using a
best guess from the git history.

Closes gh-17360

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/HateoasObjenesisCacheDisabler.java

@@ -33,7 +33,6 @@ import org.springframework.util.ReflectionUtils;
  * restarts.
  *
  * @author Andy Wilkinson
- * @since 1.3.0
  */
 class HateoasObjenesisCacheDisabler {
 

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/remote/server/HttpStatusHandler.java

@@ -27,6 +27,7 @@ import org.springframework.util.Assert;
  * {@link Handler} that responds with a specific {@link HttpStatus}.
  *
  * @author Phillip Webb
+ * @since 1.3.0
  */
 public class HttpStatusHandler implements Handler {
 

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/tunnel/server/RemoteDebugPortProvider.java

@@ -26,6 +26,7 @@ import org.springframework.boot.lang.UsesUnsafeJava;
  *
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @since 1.3.0
  */
 public class RemoteDebugPortProvider implements PortProvider {