tendermint#3031) (tendermint#3435)

close: tendermint#3002 

This PR fixes the issue reported above.

This is not a storage issue in particular, the results are still in
storage after an upgrade, but not returned properly by the RPC endpoint.
The fix is to make the `/block_results` endpoint in `v0.38` to return
properly a legacy ABCI response created with `v0.37`.

Once this fix is merged on `v0.38` and a patch release is cut, any node
on `v0.38` (e.g. an archive node) that applies the patch release, should
have the results returned properly by the RPC `/block_results` endpoint.

---

#### PR checklist

- [X] Tests written/updated
- [x] Changelog entry added in `.changelog` (we use
[unclog](https://github.com/informalsystems/unclog) to manage our
changelog)
- [ ] ~~Updated relevant documentation (`docs/` or `spec/`) and code
comments~~
- [X] Title follows the [Conventional
Commits](https://www.conventionalcommits.org/en/v1.0.0/) spec
<hr>This is an automatic backport of pull request tendermint#3031 done by
[Mergify](https://mergify.com).

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Co-authored-by: Andy Nogueira <me@andynogueira.dev>
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>