Refactor logging in LoginController, simplify auth.service token validation, and remove debug logs from AppealComponent.

backend/src/main/java/com/alttd/altitudeweb/controllers/login/LoginController.java

@@ -93,6 +93,7 @@ public class LoginController implements LoginApi {
 
     @Override
     public ResponseEntity<UsernameDto> getUsername() {
+        log.debug("Loading username for logged in user");
         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
 
         if (authentication == null || !(authentication.getPrincipal() instanceof OAuth2ResourceServerProperties.Jwt)) {
@@ -103,13 +104,14 @@ public class LoginController implements LoginApi {
         UUID uuid;
         try {
              uuid = UUID.fromString(stringUuid);
+             log.debug("Loaded username for logged in user {}", uuid);
         } catch (IllegalArgumentException e) {
             return ResponseEntity.badRequest().build();
         }
 
         UsernameDto usernameDto = new UsernameDto();
         usernameDto.setUsername(getUsername(uuid));
-
+        log.debug("Loaded username for logged in user {}", usernameDto.getUsername());
         return ResponseEntity.ok(usernameDto);
     }