[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