Migrate state DB path helpers to versioned filename

[jif-oai]

Summary

• add versioned state sqlite filename helpers and re-export them from the state crate
• remove legacy state files when initializing the runtime and update consumers/tests to use the new helpers
• tweak logs client description and database resolution to match the new path

[gt-oai]

why have versions of a database vs. migrating it? What sorts of use cases would we bump the version vs. migrating the current one?

[jif-oai]

If we need to retrigger a backfill
I don't expect this to happen much in the future but while this feature is not fully landed, it let us care less about backward compatibility