Move replay protection mempool management in ConnectTip

Summary: Various method that do not actually connect a block call ConnectBlock. ConnectTip is a much better place.

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, markblundeberg

Reviewed By: #bitcoin_abc, markblundeberg

Subscribers: markblundeberg, teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2514