Configure fabricKitRelease to be enabled only when kits are released.
Configure fabricKitRelease to be enabled only when kits are released.

- This will allow kits_for_release file to manage this task.
- When we decouple repos, this setting can be removed.

Change-Id: I7df6cdfb09916465250b54aa4b2fd20f5c8f8a17

afeiluo/twitter-kit-android,afeiluo/twitter-kit-android,t9nf/twitter-kit-android,rcastro78/twitter-kit-android,twitter/twitter-kit-android