Use new getCanonicalName and getMessage methods exposed by fbjni (#37879)

Summary:
When a new version of `fbjni` is released, we can simplify `getName` and `getMessage` calls on throwables.

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[ANDROID] [CHANGED] - Use new `getCanonicalName` and `getMessage` methods exposed by `fbjni`

Pull Request resolved: https://github.com/facebook/react-native/pull/37879

Test Plan: https://github.com/facebookincubator/fbjni/pull/78

Reviewed By: cortinico

Differential Revision: D46966561

Pulled By: javache

fbshipit-source-id: f30720a30146cf8fe5125336435a1512063c253d