RNGP - Add support for `exclusiveEnterpriseRepository` (#52378)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52378

This adds a Gradle property called `exclusiveEnterpriseRepository`
that users can set in their `android/gradle.properties` as such:

```diff
hermesEnabled=true

+exclusiveEnterpriseRepository=https://my.internal.proxy.net/
```

This will remove all the existing Maven repositories and only use the internal mirror they have.

Changelog:
[Android] [Added] - RNGP - Add support for `exclusiveEnterpriseRepository` to specify an internal Maven mirror.

Reviewed By: mdvacca

Differential Revision: D77667573

fbshipit-source-id: 835004d2ae7aa4e250b6f7a88a41918b573f5bd5