[avalanche] Gate the activation of the staking rewards preconsensus on november 15
Summary:
This will only activate if enabled and if the upgrade is activated.
In order to make it easier to test, the getinfo RPC is extended to report the activation status.
Depends on D18680.
Test Plan:
ninja check check-functional
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Subscribers: PiRK
Differential Revision: https://reviews.bitcoinabc.org/D18688