Summary:
There was some hardcoded validation logic to verify package.json and gradle.properties update. Running `pod install` before that failed this validation on release branch, so let's move the pod update a bit later in the flow.
This also restrict the version number change check to the specific files for better reliability
Changelog: [Internal]
Reviewed By: sota000
Differential Revision: D31160139
fbshipit-source-id: d32470d7dfc48c2efab1d2767f3892b33e0b77dd