Update tx-generator to not use deprecated cardano-api API

[carbolymer]

Summary

Migrate tx-generator to use the experimental cardano-api for transaction building and era dispatch.

• Use IsEra constraint and Cardano.Api.Experimental transaction building across the tx construction and submission pipeline
• Narrow era support to Conway and Dijkstra only - pre-Conway eras are no longer exercised by the benchmarking workbench
• Remove pre-Conway CBOR metadata property tests that were already broken at runtime
• Dijkstra metadata tests commented out pending makeUnsignedTx support in cardano-api

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• Any changes are noted in the CHANGELOG.md for affected package
• The version bounds in .cabal files are updated
• CI passes

[carbolymer]

Experimental API migration guide: https://gist.github.com/carbolymer/1967d68a8d4ed4b80cbbf50ee8698bf8

[carbolymer]

selftest is a smoke test for tx-generator so I presume we don't have to use Allegra here, and conway is fine?

[Copilot]

Pull request overview

This PR migrates the tx-generator benchmarking/workbench code from deprecated cardano-api APIs to the experimental transaction-building and era-dispatch APIs, while narrowing the exercised era surface to Conway and Dijkstra.

Changes:

• Switch multiple tx construction/submission paths to Cardano.Api.Experimental primitives (IsEra, useEra, makeUnsignedTx, signTx, etc.).
• Narrow era dispatch in benchmarking scripts/selftests to Conway/Dijkstra and update protocol-parameters file references to protocol-parameters-v10.json.
• Remove/comment out pre-Conway (and currently-broken) metadata CBOR property tests, and refactor the remaining metadata sizing implementation to use experimental tx building.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
bench/tx-generator/tx-generator.cabal	Updates dependencies/ghc-options to match the experimental API migration and reduced era surface.
bench/tx-generator/test/Main.hs	Drops pre-Conway metadata property tests; keeps Conway tests and comments out Dijkstra pending support.
bench/tx-generator/src/Cardano/TxGenerator/UTxO.hs	Moves UTxO output/fund construction to IsEra + obtainCommonConstraints.
bench/tx-generator/src/Cardano/TxGenerator/Utils.hs	Adds txIdFromTx and updates TxInMode construction to experimental-era constraints.
bench/tx-generator/src/Cardano/TxGenerator/Tx.hs	Reimplements genTx using experimental unsigned tx building + signing.
bench/tx-generator/src/Cardano/TxGenerator/PureExample.hs	Updates the pure example to a post-Conway era and new protocol-parameters filename.
bench/tx-generator/src/Cardano/TxGenerator/Genesis.hs	Ports genesis expenditure transaction building/signing to experimental API.
bench/tx-generator/src/Cardano/TxGenerator/Fund.hs	Narrows witness-era matching to Conway/Dijkstra under IsEra.
bench/tx-generator/src/Cardano/Benchmarking/Script/Selftest.hs	Updates protocol-parameters filename and switches selftest era to Conway.
bench/tx-generator/src/Cardano/Benchmarking/Script/Core.hs	Narrows era dispatch and ports generator evaluation/fee estimation to experimental-era constraints.
bench/tx-generator/src/Cardano/Benchmarking/GeneratorTx/SubmissionClient.hs	Ports submission client to IsEra and uses txIdFromTx for TxId extraction.
bench/tx-generator/src/Cardano/Benchmarking/GeneratorTx/SizedMetadata.hs	Reworks metadata sizing measurement to build dummy txs via the experimental API.
bench/tx-generator/src/Cardano/Benchmarking/GeneratorTx.hs	Switches the benchmark entrypoint constraints to IsEra and uses obtainCommonConstraints.
bench/tx-generator/app/calibrate-script.hs	Ports the calibration script’s tx sizing/fee approximation logic to experimental tx building and Plutus witness construction.

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[Jimbo4350]

Some more leftover types.