Fix pde.ui.templates.tests failures on Java 23

ECJ has been enhanced to warn about unused lambda parameters
(eclipse-jdt/eclipse.jdt.core#3053 ) but
templates are done for lowest Java version supported without an easy way
to generate per JVM versioned code thus there is no easy way to change
them.
Filter these warnings until Java 22 is the min required version for
templates.
Fixes I-build tests
https://download.eclipse.org/eclipse/downloads/drops4/I20241015-1820/testresults/html/org.eclipse.pde.ui.templates.tests_ep434I-unit-cen64-gtk3-java23_linux.gtk.x86_64_23.html

ui/org.eclipse.pde.ui.templates.tests/src/org/eclipse/pde/ui/templates/tests/TestPDETemplates.java

@@ -173,12 +173,18 @@ public void configureProjectAndCheckMarkers() throws CoreException {
 	private void assertErrorFree() throws CoreException {
 		IMarker[] markers = project.findMarkers(IMarker.PROBLEM, true, IResource.DEPTH_INFINITE);
 
+		// ignore "value of lambda parameter is not used", filtering should be
+		// removed once the min JVM level supports this warning (Java 22) and
+		// templates are fixed to not produce it
+		markers = Arrays.stream(markers).filter(
+				m -> !m.getAttribute(IMarker.MESSAGE, "").equals("The value of the lambda parameter e is not used"))
+				.toArray(IMarker[]::new);
+
 		// ignore missing package export marker
 		if (markers.length == 1 && CompilerFlags.P_MISSING_EXPORT_PKGS
 				.equals(markers[0].getAttribute(PDEMarkerFactory.compilerKey, ""))) {
 			System.out.println("Template '" + template.getLabel() + "' ignored errors.");
 			System.out.println(markers[0]);
-			System.out.println("--------------------------------------------------------");
 			markers = new IMarker[0];
 		}
 		// ignore "DS Annotations missing from permanent build path"