Let build_android produce a signed maven-local.zip archive (#45161)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45161

This is part of a bigger refactoring of the Android pipelines.
As `build_android` is already building everything, let's save the maven-local
so it can be reused by other jobs (test_android_helloworld and build_npm_package).

Changelog:
[Internal] [Changed] - Let build_android produce a signed maven-local.zip archive

Reviewed By: cipolleschi, blakef

Differential Revision: D59002893

fbshipit-source-id: db03946c975b2ce91dae0c4011981b2fe9dd6113