fix(assemble): Avoid increasing backlogs in assemble (#12923)

Author: jan-auer

src/sentry/api/endpoints/debug_files.py

@@ -337,7 +337,7 @@ def post(self, request, project):
 
             # We don't have a state yet, this means we can now start
             # an assemble job in the background.
-            set_assemble_status(project, checksum, state)
+            set_assemble_status(project, checksum, ChunkFileState.ASSEMBLING)
             assemble_dif.apply_async(
                 kwargs={
                     'project_id': project.id,