R1:b7e51877c316

Make storage adjustment a little nicer, especially the first time

Summary:
Fixes T11583.

- When users run `bin/storage upgrade` for the first time on a new install, we currently give them a prompt which feels rough and which they can only reasonably ever answer "yes" to.
- We generally use cautionary language ("found issues with schema") in this workflow. Adjustments are now routine, so use more neutral and progress-oriented language ("found adjustments to apply").

Test Plan:
- Ran `bin/storage…