remove `SequencerConfig` usage

[tcoratger]

SequencerConfig is marked as in the process of removal in

https://github.com/dojoengine/dojo/blob/60c1575927db63e98ababda56c5ffa9f6337fb56/crates/katana/core/src/sequencer.rs#L1-L10

There are still a few places in the code where this structure is used, for example here:

https://github.com/dojoengine/dojo/blob/60c1575927db63e98ababda56c5ffa9f6337fb56/crates/dojo-test-utils/src/sequencer.rs#L38

In order to fully deprecate this type, we need to remove uses like this.