More exhaustive golden tests for Node-to-Client queries

Currently, we have golden tests for some, but not all queries (both the encoded query and result messages):
https://github.com/IntersectMBO/ouroboros-consensus/blob/15d2e93a44cf9697d99634695e67c685540410da/ouroboros-consensus-cardano/src/shelley-testlib/Test/Consensus/Shelley/Examples.hs#L199-L217

The goal of this ticket is to extend this:

- Add golden tests for all queries, which also includes adding necessary examples for ledger types to Ledger.
- Make sure that the existing examples are sufficiently interesting; e.g. the example `PoolDistr` used for `GetStakeDistribution` has only one entry, which means that we couldn't notice that a recent Ledger update changed the encoding for maps with more than 23 elements.
- Add regressions specific to PR #922: check that Conway queries are decoder failures for era before Conway.