Refactor token handling for TOKEN_X authentication

#deploy-bruker-service

Simplified and corrected the TOKEN_X token mapping logic by replacing the use of `ObjectMapper` and error handling with direct attribute access. This improves clarity and reduces potential processing errors.

Author: krharum

libs/reactive-security/src/main/java/no/nav/testnav/libs/reactivesecurity/action/GetAuthenticatedToken.java

@@ -28,19 +28,13 @@ public Mono<Token> call() {
                 .call()
                 .flatMap(serverType -> switch (serverType) {
                     case TOKEN_X -> getJwtAuthenticationToken()
-                            .map(OAuth2AuthenticationToken.class::cast)
-                            .handle((oauth2, sink) -> {
-                                try {
-                                    sink.next(Token.builder()
-                                            .clientCredentials(false)
-                                            .userId(oauth2.getPrincipal().getAttributes().get("pid").toString())
-                                            .accessTokenValue(new ObjectMapper().writeValueAsString(oauth2))
-                                            .expiresAt((Instant) oauth2.getPrincipal().getAttributes().get("exp"))
-                                            .build());
-                                } catch (JsonProcessingException e) {
-                                    sink.error(new ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, "Feilet å konvertere token to string", e));
-                                }
-                            });
+                            .map(JwtAuthenticationToken.class::cast)
+                            .map(jwt -> Token.builder()
+                                    .clientCredentials(false)
+                                    .userId(jwt.getTokenAttributes().get("pid").toString())
+                                    .accessTokenValue(jwt.getToken().getTokenValue())
+                                    .expiresAt(jwt.getToken().getExpiresAt())
+                                    .build());
                     case AZURE_AD -> getJwtAuthenticationToken()
                             .map(JwtAuthenticationToken.class::cast)
                             .map(jwt -> Token.builder()