Fix header name

Author: manuel-alvarez-alvarez

dd-java-agent/agent-aiguard/src/main/java/com/datadog/aiguard/AIGuardInternal.java

@@ -77,7 +77,7 @@ public static void install() {
     if (isEmpty(endpoint)) {
       endpoint = String.format("https://app.%s/api/v2/ai-guard", config.getSite());
     }
-    final Map<String, String> headers = mapOf("DD-API-KEY", apiKey, "DD-APP-KEY", appKey);
+    final Map<String, String> headers = mapOf("DD-API-KEY", apiKey, "DD-APPLICATION-KEY", appKey);
     final HttpUrl url = HttpUrl.get(endpoint).newBuilder().addPathSegment("evaluate").build();
     final int timeout = config.getAiGuardTimeout();
     final OkHttpClient client = buildClient(url, timeout);

dd-java-agent/agent-aiguard/src/test/groovy/com/datadog/aiguard/AIGuardInternalTests.groovy

@@ -35,7 +35,7 @@ class AIGuardInternalTests extends DDSpecification {
   protected static final URL = HttpUrl.parse('https://app.datadoghq.com/api/v2/ai-guard/evaluate')
 
   @Shared
-  protected static final HEADERS = ['DD-API-KEY': 'api', 'DD-APP-KEY': 'app']
+  protected static final HEADERS = ['DD-API-KEY': 'api', 'DD-APPLICATION-KEY': 'app']
 
   @Shared
   protected static final ORIGINAL_TRACER = AgentTracer.get()