Refactor / remove from tests and code instances of legacy Sequencer

[ivpavici]

• describeIfDevnetSequencer
• describeIfSequencerGoerli

Also, remove commented/unnecessary Sequencer code (example is SequencerService.ts )

[RolandoDrRobot]

@ivpavici I would like to take care of this one is If you don't mind, I am working on It #954