gRPC: ReadGenesis, FollowTip and FetchBlock tests

[carbolymer]

Description

Adds integration tests for three UTxO RPC methods served by the node's gRPC endpoint, exercised end-to-end against a local testnet:

• SyncService.FetchBlock: fetches blocks by slot and by hash, and compares them against blocks observed independently via foldBlocks, including transactions carrying minted assets and Plutus scripts.
• SyncService.FollowTip: verifies tip updates are streamed as new blocks are produced.
• QueryService.ReadGenesis: verifies the returned genesis parameters match the testnet's configuration.

Also included:

• The existing SearchUtxos and Transaction RPC tests now use the shared exactAddressPredicate and txoRefUtxoRpcToTxIn helpers from cardano-rpc instead of local copies of the equivalent code.
• foldBlocks call sites are adapted to cardano-api 11.5, which takes an explicit SomeHasFS IO argument (built via mkNodeConfigFs).
• A changelog fragment in cardano-testnet/.changes/.

The commits are split per test module, each carrying its own cabal entry and test-runner registration.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. These may include:
  • golden tests
  • property tests
  • roundtrip tests
  • integration tests
    See Running tests for more details
• Any changes are noted in the CHANGELOG.md for affected package
  • cardano-node-chairman, cardano-submit-api and cardano-testnet instead need a
    changelog fragment in <package>/.changes/, because their CHANGELOG.md is generated
    from fragments at release time. Copy _TEMPLATE.yml from that directory, or run
    nix run github:input-output-hk/cardano-dev#herald -- new
• The version bounds in .cabal files are updated
• CI passes. See note on CI. The following CI checks are required:
  • Code is linted with hlint. See .github/workflows/check-hlint.yml to get the hlint version
  • Code is formatted with stylish-haskell. See .github/workflows/stylish-haskell.yml to get the stylish-haskell version
  • Code builds on Linux, MacOS and Windows for ghc-9.6 and ghc-9.12
• Self-reviewed the diff

Note on CI

If your PR is from a fork, the necessary CI jobs won't trigger automatically for security reasons.
You will need to get someone with write privileges. Please contact IOG node developers to do this
for you.

[Jimbo4350]

We have to keep an eye on these RPC tests and how much time it adds to the node's CI.