Delete interface.js (Flow)

Summary:
This appears to be a legacy, dangling, Flow-only entry point which we can remove.

Changelog: [Internal]

Differential Revision: D109018822

Author: huntie

packages/react-native/interface.js

@@ -80,7 +80,6 @@
     "gradle/libs.versions.toml",
     "index.js",
     "index.js.flow",
-    "interface.js",
     "jest-preset.js",
     "Libraries",
     "LICENSE",