OZG-7014 define registrierung path

Sub task: OZG-7225

fachstelle-server/src/main/java/de/ozgcloud/fachstelle/SecurityConfiguration.java

@@ -61,7 +61,7 @@ public class SecurityConfiguration {
 	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
 		http
 				.authorizeHttpRequests(authorize -> authorize
-						.requestMatchers("/*", "/index**", "/success", "/actuator/**", "/error", "/favicon.ico", "/fonts/**", "/webjars/**",
+						.requestMatchers("/registrierung","/*", "/index**", "/success", "/actuator/**", "/error", "/favicon.ico", "/fonts/**", "/webjars/**",
 								"/api/environment")
 						.permitAll()
 						.requestMatchers("/api", "/api/**", "/preregister", "/register").authenticated()

fachstelle-server/src/main/java/de/ozgcloud/fachstelle/registration/FachstelleRegistrationController.java

@@ -31,7 +31,7 @@ public class FachstelleRegistrationController {
 	private final FachstellenProperties properties;
 	private final FachstelleRegistrationService registrationService;
 
-	@GetMapping(produces = "text/html; charset=utf-8")
+	@GetMapping(value = "/registrierung", produces = "text/html; charset=utf-8")
 	public String startRegistration(final Model model) {
 		model.addAttribute("loginUrl", properties.getLoginRedirectUrl());
 		return "index";

fachstelle-server/src/test/java/de/ozgcloud/fachstelle/registration/FachstelleRegistrationControllerITCase.java

@@ -38,7 +38,7 @@ class FachstelleRegistrationControllerITCase {
 
 	@Test
 	void whenCallIndexPage_ThenReturnPage() throws Exception {
-		mockMvc.perform(MockMvcRequestBuilders.get("")
+		mockMvc.perform(MockMvcRequestBuilders.get("/registrierung")
 						.header("Accept-Language", "de"))
 				.andExpect(status().isOk())
 				.andExpect(content().string(containsString("Registrierung als Fachstelle")));