[CL Incentives] Make collectIncentives return forfeited amount

[AlpinYukseloglu]

Background

We separated out tracking of claimed and forfeited incentives in #4735, but still only return the claimed amount for the CollectIncentives message. It would be a good quality of life improvement to return forfeitedIncentives at these higher level functions as well.

Suggested Design

• Pick up forfeitedIncentives field returned by collectIncentivesForPosition in collectIncentives and return it
• Update message, tests, and any broken wiring

Acceptance Criteria

• All new and existing tests should pass