Soroban upgrade transaction flow in modifySorobanNetworkConfig for tests

[ThomasBrady]

Description

Resolves #4605

Checklist

• Reviewed the contributing document
• Rebased on top of master (no merge commits)
• Ran clang-format v8.0.0 (via make format or the Visual Studio extension)
• Compiles
• Ran all tests
• If change impacts performance, include supporting evidence per the performance document

[SirTyson]

It looks like you accidentally deleted a lot of the meta files for tests. Make sure you run

stellar-core test [tx] --all-versions --rng-seed 12345 --record-test-tx-meta test-tx-meta-baseline-current

without the --enable-next-protocol-version-unsafe-for-production configure flag set and

stellar-core test [tx] --all-versions --rng-seed 12345 --record-test-tx-meta test-tx-meta-baseline-next

with --enable-next-protocol-version-unsafe-for-production set.