Fix __isOSVersionAtLeast for Android (#80496)

Allow pre-release APIs on pre-release devices.

The current implementation requires __ANDROID_API_FUTURE__ to use new
APIs on pre-release system. This makes it hard to maintain the codebase
because it should be switched a concrete version (e.g. __ANDROID_API_X__
on release of X).

Instead, we can just allow pre-release APIs on pre-release system
without mandating the major version of __ANDROID_API_FUTURE__.

Note that this doesn't make API guards just no-op in pre-release builds.
We can still rely on its compile-time checks and it still works as
expected with release builds. Even with pre-release builds, it's the
same as before because we would pass __ANDROID_API_FUTURE__ to make the
calls anyway.