Deleteing a Java file from the project doesn't refresh Qute validation

To reproduce the issue:

1. Create a template extensions file that defines a template extension for java.lang.String called sandwich()

eg.

@io.quarkus.qute.TemplateExtension
public class TemplateExtensions {
	public static String sandwich(String str) {
		return str + "!";
	}
}

2. Create the following template in the templates folder:

{@String myString}

{myString.sandwich}

3. Delete the file that declares the template extension

Expected: the qute template validation refreshes, and {myString.sandwich} is marked as invalid

Actual: {myString.sandwich} is still marked as valid, and doesn't update until you modify one of the Java files.

Start with the template extensions file and the Qute validation refresh triggered by changes to Java files. Reproduce the issue using the template in the templates folder, delete the file declaring the String extension, and verify that {myString.sandwich} becomes invalid without modifying another Java file.