Run with wellington activated in the tests

Summary:
This is the continuation of D12031, setting the next release to wellington for the tests (jefferson is already feature-freezed).

Depends on D12031.

Test Plan:

ninja all check-upgrade-activated

Reviewers: #bitcoin_abc, PiRK, sdulfari

Reviewed By: #bitcoin_abc, PiRK, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D12037