Apply Builder Bean Only to Application Endpoints

A published PathPatternRequestMatcher.Builder bean is intended to align
application endpoint matchers, which commonly are from the same servlet.

This commit ensures that this bean is used by securityMatcher(s),
authorizeHttpRequests, and WebSecurity#ignoring, which target
application endpoints typically served by servlets.

This commit also adds tests ensuring that the bean is not applied to filter-chain
security endpoints such as those configured by formLogin, logout,
oneTimeTokenLogin, OAuth 2.0 Login, and SAML 2.0 Login, since
these endpoints are, by default, handled by filters independent from
any target servlet and servlet path.

Closes gh-19128

Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>

docs/src/test/java/org/springframework/security/docs/servlet/authentication/passwords/formloginservletpath/FormLoginServletPathConfiguration.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2004-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.docs.servlet.authentication.passwords.formloginservletpath;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.web.SecurityFilterChain;
+
+@EnableWebSecurity
+@Configuration(proxyBeanMethods = false)
+public class FormLoginServletPathConfiguration {
+
+	// tag::loginPage[]
+	@Bean
+	SecurityFilterChain springSecurity(HttpSecurity http) throws Exception {
+		// @formatter:off
+		http
+			.authorizeHttpRequests((authorize) -> authorize
+				.anyRequest().authenticated()
+			)
+			.formLogin((form) -> form
+				.loginPage("/api/login")
+				.loginProcessingUrl("/api/login")
+			);
+		// @formatter:on
+		return http.build();
+	}
+	// end::loginPage[]
+
+}

docs/src/test/kotlin/org/springframework/security/kt/docs/servlet/authentication/passwords/formloginservletpath/FormLoginServletPathConfiguration.kt

@@ -0,0 +1,32 @@
+package org.springframework.security.kt.docs.servlet.authentication.passwords.formloginservletpath
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.config.annotation.web.builders.HttpSecurity
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity
+import org.springframework.security.config.annotation.web.invoke
+import org.springframework.security.web.SecurityFilterChain
+
+@EnableWebSecurity
+@Configuration(proxyBeanMethods = false)
+class FormLoginServletPathConfiguration {
+
+    // tag::loginPage[]
+    @Bean
+    fun springSecurity(http: HttpSecurity): SecurityFilterChain {
+        // @formatter:off
+        http {
+            authorizeHttpRequests {
+                authorize(anyRequest, authenticated)
+            }
+            formLogin {
+                loginPage = "/api/login"
+                loginProcessingUrl = "/api/login"
+            }
+        }
+        return http.build()
+        // @formatter:on
+    }
+    // end::loginPage[]
+
+}