fix(anvil): sync state snapshots with reset and revert

[solanaXpeter]

Motivation

State snapshot metadata can diverge from backend state. anvil_reset clears chain and DB state without clearing active_state_snapshots, and revert_state_snapshot removed metadata before the DB revert succeeded. That can leave anvil_metadata reporting stale snapshots and make evm_revert depend on a partially applied rollback path.

Solution

Clear active_state_snapshots in both reset paths, and only remove a snapshot entry after the DB revert succeeds. When the backing snapshot block or DB snapshot is already gone, drop the stale metadata entry and return false without mutating chain state. Added regression tests for failed revert, in-memory reset, and fork reset paths.

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes