Integration Test Flake: partial_tenure_fork

[jferrant]

Partial tenure fork test sometimes fails, but does not seem to always fail at the same point. Example failure case:

thread 'tests::signer::v0::partial_tenure_fork' panicked at testnet/stacks-node/src/tests/signer/v0.rs:4059:13:
assertion `left == right` failed
  left: 27
 right: 32

See https://github.com/stacks-network/stacks-core/actions/runs/11393581637/job/31755882694?pr=5261