Deprecate UrlPathHelper shortcuts on AbstractHandlerMapping

Given the availability of two alternatives mechanisms for URL path
matching, PathPatternParser and AntPathMatcher, and now that
parsed patterns are enabled by default, it makes sense to reduce the
proliferation of options on AbstractHandlerMapping by deprecating
shortcuts related to String path matching. Most applications rely
on Boot and on the MVC config to do all this.

See gh-28607

spring-test/src/test/java/org/springframework/test/web/servlet/samples/spr/EncodedUriTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -46,6 +46,7 @@ import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
 import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UrlPathHelper;
 
 import static org.hamcrest.core.Is.is;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
@@ -119,7 +120,9 @@ public class EncodedUriTests {
 		public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
 			if (bean instanceof RequestMappingHandlerMapping requestMappingHandlerMapping) {
 				// URL decode after request mapping, not before.
-				requestMappingHandlerMapping.setUrlDecode(false);
+				UrlPathHelper pathHelper = new UrlPathHelper();
+				pathHelper.setUrlDecode(false);
+				requestMappingHandlerMapping.setUrlPathHelper(pathHelper);
 			}
 			return bean;
 		}