fix flaky test `local_node_try_replace_someone_else_order`

[MartinquaXD]

Background

reliable tests are important for a healthy CI pipeline

Details

CI job where the test failed: https://github.com/cowprotocol/services/actions/runs/17428512523/job/49481196830

Acceptance criteria

test no longer fails sporadically

[4ddx]

Hey @MartinquaXD , The issue seems to be stemming from calling unwrap on an Err.
I'd suggest using either unwrap_or_else(), or just do a .expect() to preserve error context, and pass in handling for cases where the variable is an Err.

Another way would be having match arms, matching Some(_), or Err. Lmk if you're ok with me creating a PR on this :D

[MartinquaXD]

That we unwrap on timeouts is intended as this is basically an assertion. The question here is why are we not able to reliably meet the conditions checked in the wait_for_condition.