Rename resharding coordinator enums to reflect the delineation between committing and aborting

Work on this ticket should include:

• Renaming CoordinatorStateEnum::kDecisionPersisted to CoordinatorStateEnum::kCommitting.
• Renaming CoordinatorStateEnum::kError to CoordinatorStateEnum::kAborting.
• Reordering CoordinatorStateEnum::kAborting to be before CoordinatorStateEnum::kCommitting in the IDL enum. This is for consistency with how kError has been reordered for the DonorStateEnum and RecipientStateEnum as part of SERVER-51606.