PrivateConstructorForUtilityClass flags @SpringBootApplication

A typical Spring Boot application will tend to have a class that looks like

```java
@SpringBootApplication
public class App {
public static void main(final String[] args) {
SpringApplication.run(App.class, args);
}
}
```

where delightful Spring magic relies on implicit extensibility to run the application. Crucially, it does not work with a private constructor or when the class is final.

For the code above, in v2.36.0, `PrivateConstructorForUtilityClass` produces this false positive violation:

```
$ ./mvnw clean test-compile -DepFlags='-XepDisableAllChecks -Xep:PrivateConstructorForUtilityClass:ERROR'
[INFO] Scanning for projects...
...
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /.../src/main/java/example/App.java:[7,8] [PrivateConstructorForUtilityClass] Classes which are not intended to be instantiated should be made non-instantiable with a private constructor. This includes utility classes (classes with only static members), and the main class.
(see https://errorprone.info/bugpattern/PrivateConstructorForUtilityClass)
Did you mean 'public final class App {'?
```

With an explicit public constructor, `PrivateConstructorForUtilityClass` shuts up and Spring Boot still works. However, I find that people tend to get confused by explicit public no-op constructors, and some linters flag them as redundant (incorrectly, IMO).

Although users can easily work around this false positive it would be nice if `PrivateConstructorForUtilityClass` could learn to recognize the `@SpringBootApplication` annotation.