Enable direct dependent skipping in xplat/js

Summary:
This has been [proven in www](https://fb.workplace.com/groups/floweng/permalink/2900038803378049/). Now that xplat is on types-first, we can turn this on.

Changelog: [Internal] Update Flow options to improve recheck speed

Reviewed By: panagosg7

Differential Revision: D18144757

fbshipit-source-id: b67660206c70d7ea81057195f365b03a7198bd07

.flowconfig

@@ -58,6 +58,7 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 experimental.well_formed_exports=true
 experimental.types_first=true
+experimental.allow_skip_direct_dependents=true
 
 [lints]
 sketchy-null-number=warn

.flowconfig.android

@@ -58,6 +58,7 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 experimental.well_formed_exports=true
 experimental.types_first=true
+experimental.allow_skip_direct_dependents=true
 
 [lints]
 sketchy-null-number=warn