local-cli: remove 'unbundle' naming in CLI (#21013)

Summary:
This also relink the require() onto `RamBundle.js` from Metro so we can remove `unbundle.js` from there completely.
Pull Request resolved: facebook/react-native#21013

Reviewed By: hramos

Differential Revision: D9721443

Pulled By: jeanlauliac

fbshipit-source-id: 3e42ebde4cb2c735ef0934ba3b1e20f1054440df

Author: Jean Lauliac

bundle/ramBundle.js

@@ -11,7 +11,7 @@
 
 const bundleWithOutput = require('./bundle').withOutput;
 const bundleCommandLineArgs = require('./bundleCommandLineArgs');
-const outputUnbundle = require('metro/src/shared/output/unbundle');
+const outputUnbundle = require('metro/src/shared/output/RamBundle');
 
 /**
  * Builds the bundle starting to look for dependencies at the given entry path.

bundle/unbundle.js

@@ -41,7 +41,6 @@ const documentedCommands = [
   require('./runAndroid/runAndroid'),
   require('./library/library'),
   require('./bundle/bundle'),
-  require('./bundle/unbundle'),
   require('./bundle/ramBundle'),
   require('./eject/eject'),
   require('./link/link'),