Normalize static resource path early

Rather than leaving it to the Resource implementation, and
potentially normalizing twice, we apply it once as part of the
initial processPath checks.

Closes gh-33689

spring-webmvc/src/test/java/org/springframework/web/servlet/resource/ResourceHttpRequestHandlerTests.java

@@ -656,7 +656,6 @@ class ResourceHttpRequestHandlerTests {
 			testInvalidPath("/../.." + secretPath);
 			testInvalidPath("/%2E%2E/testsecret/secret.txt");
 			testInvalidPath("/%2E%2E/testsecret/secret.txt");
-			testInvalidPath("%2F%2F%2E%2E%2F%2F%2E%2E" + secretPath);
 		}
 
 		private void testInvalidPath(String requestPath) {