Add idempotent object deletion

internal/stage/analyze_test.go

@@ -1853,6 +1853,11 @@ func (s *analyzeObjectStoreTracker) UploadConditional(context.Context, io.Reader
 	return storage.ObjectInfo{}, errors.New("unexpected conditional object store upload call")
 }
 
+func (s *analyzeObjectStoreTracker) Delete(context.Context, string) error {
+	s.called = true
+	return errors.New("unexpected object store delete call")
+}
+
 func (s *analyzeObjectStoreTracker) Exists(context.Context, string) (bool, error) {
 	s.called = true
 	return false, errors.New("unexpected object store exists call")

internal/stage/prepare_previous_test.go

@@ -425,6 +425,10 @@ func (s *preparePreviousCaptureStore) UploadConditional(ctx context.Context, sou
 	return s.delegate.UploadConditional(ctx, source, key, opts, condition)
 }
 
+func (s *preparePreviousCaptureStore) Delete(ctx context.Context, key string) error {
+	return s.delegate.Delete(ctx, key)
+}
+
 func (s *preparePreviousCaptureStore) Exists(ctx context.Context, key string) (bool, error) {
 	s.existsKeys = append(s.existsKeys, key)
 	return s.delegate.Exists(ctx, key)