Implement JSON security context serializer (new default) - smaller info and human readable (#2652)

keeps backward compatibility by being able to fallback to JAVA_SERIALIZATION

+ fix DMF messages with status code

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-artifact/hawkbit-artifact-fs/src/test/java/org/eclipse/hawkbit/artifact/fs/FileArtifactStorageTest.java

@@ -36,6 +36,8 @@ import org.junit.jupiter.api.Test;
 class FileArtifactStorageTest {
 
     private static final String TENANT = "test_tenant";
+    @SuppressWarnings("java:S1068") // used for tests only, no need of secure random
+    private static final Random RND = new Random();
 
     private static FileArtifactProperties artifactResourceProperties;
     private static FileArtifactStorage artifactFilesystemRepository;
@@ -130,7 +132,7 @@ class FileArtifactStorageTest {
 
     private static byte[] randomBytes() {
         final byte[] randomBytes = new byte[20];
-        new Random().nextBytes(randomBytes);
+        RND.nextBytes(randomBytes);
         return randomBytes;
     }