FolderClosedException not propagated in IdleManager, no event fired

**Describe the bug**
I see the follow log:

```
DEBUG IMAP: IdleManager waiting...
DEBUG IMAP: IdleManager selected 1 channels
DEBUG IMAP: IdleManager selected folder: imaps://email%40inetsoftware.de@mail.inetsoftware.de/INBOX
* BYE Server shutting down.
DEBUG IMAP: handleIdle: set to RUNNING
DEBUG IMAP: IdleManager got exception for folder: imaps://email%40inetsoftware.de@mail.inetsoftware.de/INBOX, THROW:
jakarta.mail.FolderClosedException: * BYE Server shutting down.
at org.eclipse.angus.mail.imap.IMAPFolder.handleIdle(IMAPFolder.java:3324)
at org.eclipse.angus.mail.imap.IdleManager.processKeys(IdleManager.java:358)
at org.eclipse.angus.mail.imap.IdleManager.select(IdleManager.java:269)
at org.eclipse.angus.mail.imap.IdleManager.access$200(IdleManager.java:118)
at org.eclipse.angus.mail.imap.IdleManager$1.run(IdleManager.java:147)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
```

I have registered listener on store and folder:

```
ConnectionListener listener = new ConnectionListener() {
@Override
public void opened( ConnectionEvent e ) {
}
@Override
public void disconnected( ConnectionEvent e ) {
LOGGER.debug ( "Disconnected: " + folder );
}
@Override
public void closed( ConnectionEvent e ) {
LOGGER.debug ( "Closed: " + folder );
}
};
store.addConnectionListener( listener );
folder.addConnectionListener( listener );
```

But I get no ConnectionEvent that I can handle correct the broken connection. Also IdleManager.watch() does not throw any exception.

Start by tracing IMAPFolder.handleIdle and IdleManager.processKeys/select, then inspect IdleManager.watch() and the registered ConnectionListener behavior. Reproduce the server-shutdown path and verify that FolderClosedException results in the appropriate connection event and that watch() exposes the failure as expected.

Written by the indexing model from the issue text.