Validation for duplicate Qute TemplateExtension

Given those 2 classes which defines the same foo TemplateExtension:

package util;

import io.quarkus.qute.TemplateExtension;

public class CLassA {

	@TemplateExtension
	public static boolean foo() {
		return true;
	}
}

and

package util;

import io.quarkus.qute.TemplateExtension;

public class CLassB {

	@TemplateExtension
	public static boolean foo() {
		return false;
	}
}

We should study the behavior of the Qute (perhapsit reports some error when the Qute application is compiled). According the behavior we should perhaps reporting error like duplicate foo TemplateEtension.

Start by reproducing the two util classes shown in the issue and observe whether Qute reports the duplicate foo TemplateExtension during application compilation. Then locate the quarkus-ls validation path for Qute TemplateExtension declarations. Done means duplicate extensions are reported with a clear diagnostic, or the observed Qute behavior is documented if no validation is appropriate.