Datastore not persisted on initial start

[fredcarle]

Describe the problem
When starting DefraDB for the first time (no DefraDB root dir) the datastore isn't persisted until restart. This means that if you start, stop, and then start again DefraDB, the data written from that point on will persist. But if writing data on the first start and then stop, and start the DB again, none of that data will be persisted.

To Reproduce

• Fresh start of DefraDB with no existing root dir.
• Write data
• Stop and Start DefraDB
• Do a DB dump
• The datastore will be clean.

Expected behavior
Data should persist after first start

Platform
(c546ca4 2023-04-05) built with Go 1.19.7 darwin/arm64

Additional context
nil

[fredcarle]

Already covered and fixed by #1299