Wrong warning - Unboxing possibly null value

### Apache NetBeans version

Apache NetBeans 18

### What happened

Editor is showing a warning about unboxing possibly null value when the check for possibly null value is added.

### How to reproduce

```java
public class NewClass {

public void test(TestClass arg) {
long testVal1 = arg.getValue(); //this line should/could show a warning, but it doesn't
long testVal2 = arg.getValue() != null?arg.getValue():0; //this line shouldn't show a warning, but it does
}


public class TestClass {
private final Long value = null;

public Long getValue() {
return value;
}
}
}
```

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 10 Pro (2H22) running on amd64; Cp1250; en_US (nb)

### JDK

Java 11; OpenJDK 64-Bit Server VM 11+28

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No

Start by reproducing the warning in Apache NetBeans 18 with the Java sample from the issue. Trace the Java editor's nullability analysis for the conditional check and the unboxing assignment. Done means the direct unboxing is warned about and the guarded conditional expression is not.

Written by the indexing model from the issue text.