tests: Add a test for log-iter-pidgin/rewind
tests: Add a test for log-iter-pidgin/rewind

... to cover text events spanning multiple days.

Fixes: https://bugs.freedesktop.org/41772

freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger