Extract database clip saving into saveClip()

persistClip() had grown too large and handled multiple concerns.
This change moves the database save logic into saveClip(), making
persistClip() smaller and easier to refactor further.

src/main/java/com/ddf/vodsystem/services/JobService.java

@@ -119,10 +119,10 @@ public class JobService {
         try {
             Optional<User> user = userService.getLoggedInUser();
             compressionService.compress(job.getInputFile(), job.getOutputFile(), job.getOutputClipOptions(), job.getStatus().getProcess())
-                    .thenRun(() -> user.ifPresent(value ->
+                    .thenRun(() -> user.ifPresent(userVal ->
                             clipService.persistClip(
                                     job.getOutputClipOptions(),
-                                    value,
+                                    userVal,
                                     job.getOutputFile(),
                                     job.getInputFile().getName()
                             )