[Chronik] Resync index

Summary:
Revert the index until the fork block relative to the node and then add blocks from the node until synced

Depends on D13294 and D13293.

Test Plan: ./test/functional/test_runner.py chronik_resync

Reviewers: Fabien, #bitcoin_abc

Reviewed By: Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D13277