[MAINTENANCE] - Remove usages of `SafeHash`

## What

Replace all usages of `SafeHash` with unverified `Hash` unless in cases where it is possible to track the source of the hash. If somewhere this is unavoidable, wait till the last second before unsafely converting to `SafeHash`.

## Why

`SafeHash` is meant to encode that the hash has a pre-image, but this is not enforceable most of the time in practice, since both `cardano-cli` and `cardano-api` are often provided with the hash only, not with the pre-image.

## Acceptance Criteria

- There are no unsafe creations of `SafeHash` with the possible exception of just before interfaces with modules down the stack if unavoidable.