Turn on flags that will be on by default in 0.281 in oss projects

Summary: Changelog: [Internal]

Reviewed By: gkz

Differential Revision: D81190534

fbshipit-source-id: 83be2aed3d13e225bfc9c07c57da22324c04ce77

Author: SamChou19815

.flowconfig

@@ -77,6 +77,7 @@ react.runtime=automatic
 
 experimental.only_support_flow_fixme_and_expected_error=true
 experimental.require_suppression_with_error_code=true
+experimental.invariant_subtyping_error_message_improvement=true
 
 ban_spread_key_props=true