feat: change the errormessage to show what failure occurs

Author: Melissa Mazura

app/src/main/java/fr/free/nrw/commons/upload/worker/UploadWorker.kt

@@ -299,6 +299,7 @@ class UploadWorker(var appContext: Context, workerParams: WorkerParameters) :
     private suspend fun uploadContribution(contribution: Contribution) {
         if (contribution.localUri == null || contribution.localUri.path == null) {
             Timber.e("""upload: ${contribution.media.filename} failed, file path is null""")
+            contribution.errorMessage = "genuine failure: file path is null"
         }
         // FP: this is an obvious genuine failure point
             // But the actual return point is not here
@@ -387,6 +388,7 @@ class UploadWorker(var appContext: Context, workerParams: WorkerParameters) :
                                 // genuine failure, and if we want a more extensive description then
                                 // we have those as well
                             Timber.e("Stash Upload failed")
+                            contribution.errorMessage = "ambiguous failure: Stash Upload failed"
                             showFailedNotification(contribution)
                             contribution.state = Contribution.STATE_FAILED
                             contribution.chunkInfo = null
@@ -399,6 +401,7 @@ class UploadWorker(var appContext: Context, workerParams: WorkerParameters) :
                             // at least have an exception to work with. And as we have already
                             // passed one upload step we can be pretty certain this is not a
                             // genuine failure.
+                        contribution.errorMessage = "failure: upload to stash failed"
                         Timber.e(exception)
                         Timber.e("Upload from stash failed for contribution : $filename")
                         showFailedNotification(contribution)
@@ -419,6 +422,7 @@ class UploadWorker(var appContext: Context, workerParams: WorkerParameters) :
                         // This only gives us a failure, nothing more to work with, so can't say it
                         // is a genuine failure. This is probably where invalid or missing filename
                         // will fail
+                    contribution.errorMessage = "ambiguous failure: upload to stash failed"
                     Timber.e("""upload file to stash failed with status: ${stashUploadResult.state}""")
                     showFailedNotification(contribution)
                     contribution.state = Contribution.STATE_FAILED
@@ -431,6 +435,7 @@ class UploadWorker(var appContext: Context, workerParams: WorkerParameters) :
                 // Ambiguous in the sense that it is hard to determine from code, but we
                 // at least have an exception to work with. Might also be here invalid filename
                 // fails
+            contribution.errorMessage = "failure: upload failed for contribution"
             Timber.e(exception)
             Timber.e("Stash upload failed for contribution: $filename")
             showFailedNotification(contribution)