Describe what LazilyRefreshDatabase actually defers

[sulimanbenhalim]

testing.md says LazilyRefreshDatabase "skips even that first migration if the schema is already up to date". It defers on database access, not schema state.

The trait hangs baseRefreshDatabase() off beforeExecuting and beforeStartingTransaction, so it fires on first use. Two tests in one class, the first one never querying:

[1] test that never queries -> migrated=false
[2] test that runs a query   -> migrated=true

Nothing in there checks whether the schema is current. Reworded to match.