Placeholder Actor Code Cid mismatch

When new placeholder actors are created, the VM loads the PLACEHOLDER_ACTOR_CODE_ID from the builtin_actors manifest stored in the DefaultCallManager.

However, when checking this against the expected value (statically generated in the builtin-actors test code) there is a mismatch.

Start by tracing how the VM loads PLACEHOLDER_ACTOR_CODE_ID from the builtin_actors manifest in DefaultCallManager, then compare it with the expected value generated by the builtin-actors test code. Confirm the mismatch and identify the intended source of truth before changing the relevant manifest or test data.

Written by the indexing model from the issue text.