Use prepare_parent_state in state manager call_raw

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Use TipsetExecutor::prepare_parent_state (cron + pending migration if any).

Reference issue to close (if applicable)

Closes #6446

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Summary by CodeRabbit

• Bug Fixes
  • Refined state value computation logic to properly derive states when needed, with enhanced error handling and reporting for state preparation failures.

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Actionable comments posted: 1

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Inline comments:
In `@src/state_manager/message_simulation.rs`:
- Around line 42-44: The call to exec.prepare_parent_state(genesis_timestamp,
VMTrace::NotTraced, &mut no_cb)? lacks any error context; change it to use
anyhow::Context so failures include call-site info (e.g., use
exec.prepare_parent_state(...).context(format!("failed to prepare parent state
for genesis_timestamp={}", genesis_timestamp))?), ensuring the returned
(state_cid, _, _) bind remains the same and still handles the Result from
prepare_parent_state with context attached.

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Reviewing files that changed from the base of the PR and between c89d3e3 and ad5e956.

📒 Files selected for processing (1)

• src/state_manager/message_simulation.rs