Changes

tsk8: Implements REST tests for recent stories
This commit introduces REST integration tests for the
`/api/microstories/recents` endpoint, verifying that the service
correctly retrieves and orders the 6 most recent stories. To ensure
consistent results, the timestamp handling in `StoriesDataset` and the
XML datasets was adjusted to align with DBUnit expectations. The dataset
files now use SQL-style timestamps (`yyyy-MM-dd HH:mm:ss`), and
`StoriesDataset` uses
`LocalDateTime` instead of `Instant.parse()` to avoid timezone
discrepancies. The dataset file was moved to the datasets/ directory,
matching the framework’s default lookup path. Additionally, a
cleanup.sql script was introduced to clear test tables between
executions, ensuring isolation and preventing residual data issues.