flamenco, vm: direct mapping: split translate_and_update_accounts into two phases

[topointon-jump]

Implementing anza-xyz/agave#8545. No change when stricter_abi_and_runtime_constraints is not activated.

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.076959 s	0.077189 s	0.299% ✅
backtest mainnet-368528500-perf snapshot load	3.115 s	2.995 s	-3.852% ✅
backtest mainnet-368528500-perf total elapsed	76.959403 s	77.188957 s	0.298% ✅
firedancer mem usage with mainnet.toml	996.11 GiB	996.11 GiB	0.000% ✅

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.063577 s	0.06403 s	0.713% ✅
backtest mainnet-368528500-perf snapshot load	2.381 s	2.387 s	0.252% ✅
backtest mainnet-368528500-perf total elapsed	63.576625 s	64.029756 s	0.713% ✅
firedancer mem usage with mainnet.toml	997.12 GiB	997.12 GiB	0.000% ✅