Bael 3970 (#9236)

* Manual logout with Spring Security
- Basic manual logout
- logout with Clear Data Site Header

* Add missing annotation for controller. Change mapping URL value.

* Add intergration tests for manual logouts.

* BAEL-3970 - Add asserts on test. Fix tests names. Remove unused imports.

* BAEL-3970 - Use PostMapping annotation. Remove unnecessary information for security configuration.

* remove logout controllers

* Add multiple entrypoints configurations. Create custom handlers for different logouts (basic, cookie clearing, clear-site-data).

* Refactor configuration with lambda DSL.

* BAEL-3970 - Remove unnecessary handler for basic logout. Fix integration tests for basic logout.

spring-5-security/src/test/java/com/baeldung/manuallogout/ManualLogoutIntegrationTest.java

@@ -39,15 +39,10 @@ public class ManualLogoutIntegrationTest {
     @Test
     public void givenLoggedUserWhenUserLogoutThenSessionClearedAndNecessaryCookieCleared() throws Exception {
 
-        MockHttpServletRequest requestStateAfterLogout = this.mockMvc.perform(post("/basic/basiclogout").secure(true).with(csrf()))
+        this.mockMvc.perform(post("/basic/basiclogout").secure(true).with(csrf()))
                 .andExpect(status().is3xxRedirection())
                 .andExpect(unauthenticated())
-                .andExpect(cookie().maxAge(AbstractRememberMeServices.SPRING_SECURITY_REMEMBER_ME_COOKIE_KEY, 0))
-                .andReturn()
-                .getRequest();
-
-        HttpSession sessionStateAfterLogout = requestStateAfterLogout.getSession();
-        assertNull(sessionStateAfterLogout.getAttribute(ATTRIBUTE_NAME));
+                .andReturn();
     }
 
     @WithMockUser(value = "spring")