fix: align utility-class constructors and unbreak the build

The Copilot Autofix commit gave ClassMemberAccessor a throwing constructor but
left it unformatted, so spotless:check (the first Build step) failed and every
downstream job skipped. It also used a fully qualified Messages reference rather
than the imported short form the rest of the code base uses.

This reformats ClassMemberAccessor to the convention (import Messages, literal
class name) and applies the same convention to the two utility classes Copilot
flagged, Phobos and Localisation, which still threw a generic IllegalStateException
with a hard-coded English message. All three now throw a SecurityException with
Messages.localized("security.general.utility.initialization", <ClassName>),
matching FileHandlerConstants and the other utility classes, so the failure type
and message are consistent and locale-independent.

Author: Markus Paulsen

src/main/java/de/tum/cit/ase/ares/api/localization/Localisation.java

@@ -14,7 +14,7 @@
 public final class Localisation {
 
 	private Localisation() {
-		throw new IllegalStateException("Utility class should not be instantiated");
+		throw new SecurityException(Messages.localized("security.general.utility.initialization", "Localisation"));
 	}
 
 	public static List<Path> filesToCopy() {

src/main/java/de/tum/cit/ase/ares/api/phobos/Phobos.java

@@ -11,6 +11,7 @@
 import com.opencsv.exceptions.CsvException;
 
 import de.tum.cit.ase.ares.api.aop.java.javaAOPModeData.JavaCSVFileLoader;
+import de.tum.cit.ase.ares.api.localization.Messages;
 import de.tum.cit.ase.ares.api.phobos.java.JavaPhobosTestCaseSupported;
 import de.tum.cit.ase.ares.api.policy.policySubComponents.FilePermission;
 import de.tum.cit.ase.ares.api.policy.policySubComponents.NetworkPermission;
@@ -35,7 +36,7 @@
 public final class Phobos {
 
 	private Phobos() {
-		throw new IllegalStateException("Utility class should not be instantiated");
+		throw new SecurityException(Messages.localized("security.general.utility.initialization", "Phobos"));
 	}
 
 	/**