Fix SAML logout log messages

Fixes SAML logout log messages incorrectly referring to logout
response instead of logout request and vice versa.

Closes gh-12129

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSamlLogoutRequestValidator.java

@@ -126,7 +126,7 @@ public final class OpenSamlLogoutRequestValidator implements Saml2LogoutRequestV
 			RelyingPartyRegistration registration) {
 		return (errors) -> {
 			if (request.getIssuer() == null) {
-				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_ISSUER, "Failed to find issuer in LogoutResponse"));
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_ISSUER, "Failed to find issuer in LogoutRequest"));
 				return;
 			}
 			String issuer = request.getIssuer().getValue();
@@ -142,7 +142,7 @@ public final class OpenSamlLogoutRequestValidator implements Saml2LogoutRequestV
 		return (errors) -> {
 			if (request.getDestination() == null) {
 				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_DESTINATION,
-						"Failed to find destination in LogoutResponse"));
+						"Failed to find destination in LogoutRequest"));
 				return;
 			}
 			String destination = request.getDestination();

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2LogoutResponseFilter.java

@@ -114,7 +114,7 @@ public final class Saml2LogoutResponseFilter extends OncePerRequestFilter {
 				logoutRequest.getRelyingPartyRegistrationId());
 		if (registration == null) {
 			this.logger
-					.trace("Did not process logout request since failed to find associated RelyingPartyRegistration");
+					.trace("Did not process logout response since failed to find associated RelyingPartyRegistration");
 			Saml2Error error = new Saml2Error(Saml2ErrorCodes.RELYING_PARTY_REGISTRATION_NOT_FOUND,
 					"Failed to find associated RelyingPartyRegistration");
 			response.sendError(HttpServletResponse.SC_BAD_REQUEST, error.toString());