[avalanche] Remove some bucket brigading in the Processor

Summary: Also remove the dependency between the processor.h and peermanager.h . This dependency made no sense to begin with.

Test Plan:

ninja check-all

Reviewers: #bitcoin_abc, Detetivepro1, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: Detetivepro1

Differential Revision: https://reviews.bitcoinabc.org/D9747