TF-4236 Misleading variable name: maxBatches represents batch size, not batch count.

lib/features/email/domain/exceptions/email_exceptions.dart

@@ -24,4 +24,4 @@ class NotParsableBlobIdToEmailException implements Exception {
   NotParsableBlobIdToEmailException({this.ids});
 }
 
-class EmailIdListIsEmptyException implements Exception {}
+class EmailIdsSuccessIsEmptyException implements Exception {}

lib/features/email/domain/usecases/add_a_label_to_a_thread_interactor.dart

@@ -37,7 +37,7 @@ class AddALabelToAThreadInteractor {
         ));
       } else if (result.emailIdsSuccess.isEmpty) {
         yield Left(AddALabelToAThreadFailure(
-          exception: EmailIdListIsEmptyException(),
+          exception: EmailIdsSuccessIsEmptyException(),
           labelDisplay: labelDisplay,
         ));
       } else {

lib/features/email/domain/usecases/labels/remove_a_label_from_a_thread_interactor.dart

@@ -37,7 +37,7 @@ class RemoveALabelFromAThreadInteractor {
         ));
       } else if (result.emailIdsSuccess.isEmpty) {
         yield Left(RemoveALabelFromAThreadFailure(
-          exception: EmailIdListIsEmptyException(),
+          exception: EmailIdsSuccessIsEmptyException(),
           labelDisplay: labelDisplay,
         ));
       } else {