Fix and re-enable commented tests

[notdanilo]

The following tests were disabled because they aren't passing and they are blocking unrelated PRs. They were already broken when the CI was enabled and they should be fixed to keep the test coverage as expected.

    nash::account::cancel_all_orders
    nash::account::cancel_order
    nash::account::limit_buy
    nash::account::limit_buy_fok
    nash::account::limit_buy_ioc
    nash::account::limit_sell
    nash::account::market_buy
    nash::account::market_sell

For more info check: https://github.com/nash-io/openlimits/pull/152/checks?check_run_id=1710957680