fix: adjust phase1 conway validation

[scarmuega]

Summary by CodeRabbit

• Refactor
  • Enhanced internal validation logic for improved code maintainability and efficiency.

[rodrigosuaya]

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Walkthrough

This PR refactors Conway era validation logic by introducing abstraction-based imports (ComputeHash, MultiEraValue), simplifying datum value extraction through helper methods instead of exhaustive pattern matching, and streamlining datum hash verification with tightened control flow and reduced branching.

Changes

Cohort / File(s)	Summary
Core validation refactoring pallas-validate/src/phase1/conway.rs	Updated imports to include ComputeHash and MultiEraValue from pallas_traverse; rewrote val_from_multi_era_output to use value() and into_conway() helper methods; refined check_input_datum_hash_in_witness_set to fetch outputs via MultiEraInput, return PostAlonzo(InputNotInUTxO) when missing, and only validate datum hashes for DatumOption::Hash variants; simplified null/None handling paths.
Test imports pallas-validate/tests/conway.rs	Added ComputeHash to imports from pallas_traverse.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

The changes involve non-trivial logic refactoring (rewritten datum value extraction, restructured datum hash validation) concentrated in one core file with improved abstraction usage, but no public API modifications or substantial expansion in scope.

Poem

🐰 Hops of joy for cleaner code,
Abstractions pave the bunny road,
Pattern matching melts away,
Datum hashes have their say,
Conway's logic, lean and spry—
Branching paths now simplified! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/phase1-validation

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 55adca9 and 693b291.

📒 Files selected for processing (2)

• pallas-validate/src/phase1/conway.rs (3 hunks)
• pallas-validate/tests/conway.rs (1 hunks)

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