Handling a signal using `jdk.unsupported/share/classes/sun/misc/SignalHandler.java` is failing since `22+b08`.

Looks like it was the change:
8308591: JLine as the default Console provider

JLine uses Signal.
Running with -Djdk.console=java.base does restore the old working signal behaviour.

### Reproduction

```
$ cat Jdk8346805_SignalHandlerJLineTest.java
import sun.misc.Signal;
public final class Jdk8346805_SignalHandlerJLineTest {
    public static void main(String[] args) throws java.io.IOException {
        Signal.handle(new Signal("INT"), signal -> System.out.format("[%s]", signal));
        while (true) { if ("x".equals(System.console().readLine())) { break; } }
    }
}

$ ~/oracle/jdk-22.0.2/bin/java Jdk8346805_SignalHandlerJLineTest.java
asd
foo
ff
[PRESSING CTRL+C AT THIS POINT]
Exception in thread "main" jdk.internal.org.jline.reader.UserInterruptException
at jdk.internal.le/jdk.internal.org.jline.reader.impl.LineReaderImpl.readLine(LineReaderImpl.java:717)
at jdk.internal.le/jdk.internal.org.jline.reader.impl.LineReaderImpl.readLine(LineReaderImpl.java:468)
at jdk.internal.le/jdk.internal.org.jline.JdkConsoleProviderImpl$JdkConsoleImpl.readLine(JdkConsoleProviderImpl.java:98)
at jdk.internal.le/jdk.internal.org.jline.JdkConsoleProviderImpl$JdkConsoleImpl.readLine(JdkConsoleProviderImpl.java:106)
at java.base/java.io.ProxyingConsole.readLine(ProxyingConsole.java:122)
at Jdk8346805_SignalHandlerJLineTest.main(Jdk8346805_SignalHandlerJLineTest.java:5)

$ ~/oracle/jdk-22.0.2/bin/java -Djdk.console=java.base Jdk8346805_SignalHandlerJLineTest.java
asd
foo
^C[SIGINT]

^C[SIGINT]

x
```

A command-line app that reads the terminal is likely to have found System.console() useful, and is also likely to be the kind of app that found this way of installing a SignalHandler to protect itself from accidental control-C killing the app.