Fix JSI `isArray` method to match JS `Array.isArray` (#53998)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53998

As the previous few diffs, JSI `isArray` API should follow
`Array.isArray` from the JS spec.

The current implementation does not consider Proxy objects, only Array
exotic objects.

Changelog: [Internal]

Reviewed By: lavenzg

Differential Revision: D83391784

fbshipit-source-id: 6db8e5a48458a1aa57006fb0747f62ec78efa675