Update CircleCI to auto-deploy release branch on push

Summary:
Changelog: [Internal] Update CircleCI to auto-deploy release branch on push

This work is part of an effort to automate the release process by using a push to a release branch as a trigger to prepare, package and deploy react-native to npm from CircleCI

The following diagram describes the context (what kind of releases we do, relevant scripts and what they do), the pre-existing process for the different types of release and how I've modified the process.
{F683387103}

This diff updates the relevant CircleCI workflows

Reviewed By: sota000

Differential Revision: D32702420

fbshipit-source-id: e20cdeb53eb4a8ce7e54e083e3e14bd89e11b789

scripts/publish-npm.js

@@ -116,9 +116,7 @@ if (dryRunBuild) {
 // For stable, pre-release releases, we manually call bump-oss-version on release branch
 if (nightlyBuild || dryRunBuild) {
   if (
-    exec(
-      `node scripts/bump-oss-version.js --nightly --to-version ${releaseVersion}`,
-    ).code
+    exec(`node scripts/set-rn-version.js --to-version ${releaseVersion}`).code
   ) {
     echo('Failed to bump version number');
     exit(1);