Decide how to set the initial checkpoint hash

Problem/Motivation

At the moment \Drupal\Core\Config\Checkpoint\CheckpointStorage::checkpoint() creates an initial checkpoint hash from random data. It would be amazing if somehow we could fingerprint the active storage in an efficient way.

See https://git.drupalcode.org/project/distributions_recipes/-/merge_request...

Proposed resolution

TBD

Remaining tasks

User interface changes

API changes

Data model changes