Fixes 4344 - Duplicate Uploads (#4442)

* Fixes 4344
- Update the retention policy of the Work Manager to ExistingWorkPolicy.APPEND_OR_REPLACE- which would append the new work to the end of existing one. This helps remove the while loop in UploadWorker which was meant to handle the cases where a new worker would be created for retries. The while loop seemed to have race conditions uploading duplicate entries.

* Update states to IN_PROGRESS before uploads are processed

app/src/main/java/fr/free/nrw/commons/contributions/MainActivity.java

@@ -318,7 +318,7 @@ public class MainActivity  extends BaseActivity
         } else {
             WorkManager.getInstance(getApplicationContext()).enqueueUniqueWork(
                 UploadWorker.class.getSimpleName(),
-                ExistingWorkPolicy.KEEP, OneTimeWorkRequest.from(UploadWorker.class));
+                ExistingWorkPolicy.APPEND_OR_REPLACE, OneTimeWorkRequest.from(UploadWorker.class));
 
             viewUtilWrapper
                 .showShortToast(getBaseContext(), getString(R.string.limited_connection_disabled));