Configure CheckStyle rule for empty catch blocks

This commit configures a new CheckStyle rule that fails for empty
"catch" blocks, unless the exception is named "ignored" or "expected".

This also fixes the remaining instances missed by the previous commit.

Closes gh-35047

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ExceptionHandlerExceptionResolverTests.java

@@ -611,7 +611,8 @@ class ExceptionHandlerExceptionResolverTests {
 
 		@ExceptionHandler(SocketTimeoutException.class)
 		@ResponseStatus(code = HttpStatus.GATEWAY_TIMEOUT, reason = "gateway.timeout")
-		public void handleException(SocketTimeoutException ignored) {
+		public void handleException(SocketTimeoutException ex) {
+
 		}
 	}