Check stack frames are correctly cleared when `hlt` is called

We should ensure that the call to `hlt` instruction is only made after everything has been torn down so we do not leak anything.

An idea of how to implement such a fix can be found at [PR comment](https://github.com/hyperlight-dev/hyperlight/pull/1072#issuecomment-3609786020).
Which basically says we should use minimal `assembly` that only calls a rust function and then runs `hlt`, which ensures anything has been torn down before calling `hlt`