Add support to disable multi-threaded compression at install time

Test: th
Bug: 313962438
Change-Id: Ifccc955e82acb7ad26479e012db91fd0ce866c49
diff --git a/payload_consumer/install_plan.h b/payload_consumer/install_plan.h
index bad34a0..dbbe4b2 100644
--- a/payload_consumer/install_plan.h
+++ b/payload_consumer/install_plan.h
@@ -204,7 +204,7 @@
   bool batched_writes = false;
 
   // Whether to enable multi-threaded compression on COW writes
-  bool enable_threading = false;
+  std::optional<bool> enable_threading;
 };
 
 class InstallPlanAction;