[avalanche] Activate avalanche preconsensus on November 15
Summary:
This enables the feature options by default. It is still gated with the activation MTP.
The preconsensus mining is disabled by default on tests since most tests rely on the
legacy mining algorithm. Individual tests can enable it if needed.
Depends on D18701.
Test Plan:
ninja all check-all ninja check-upgrade-activated
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D18702