Create Migration Test for FIP-0085 in Lotus to Assert New State of f090

[rjan90]

Done Criteria

1. A migration test is created in Lotus to assert the new state of f090 as per FIP-0085.
2. The test verifies that f090 has been converted from a multisig actor to a keyless account actor.
3. The test is integrated into the existing Lotus test suite and passes all checks.

Why Important

1. Ensures that the migration of f090 to a keyless account actor is correctly implemented and verifiable.
2. Prevents potential issues that could arise from the migration by catching them early in the testing phase.
3. Provides a clear and automated way to verify the state of f090, reducing the risk of human error.

User/Customer

Maintainers and developers working on the Lotus project.

Notes

1. The migration of f090 is detailed in FIP-0085](https://github.com/filecoin-project/FIPs/blob/master/FIPS/fip-0085.md).
2. The PR adding the migration can be found here.
3. Ensure that the test covers all edge cases and scenarios outlined in the FIP.
4. Coordinate with the team to integrate the test into the CI/CD pipeline for continuous verification.

[BigLep]

#fil-lotus-dev slack thread: https://filecoinproject.slack.com/archives/CP50PPW2X/p1718627270414419

I'm working to make sure we complete this by EOD 2024-06-26.

[BigLep]

Per Slack, @ZenGround0 is going to take this with goal to land before the Lotus 1.28.0 RC.

[BigLep]

Closing given #12139 was merged