declare strict_types in Pathologic

Per core, better to not use FormattableMarkup at all. There was also a stray t() left over. Otherwise, we were already strict. Now we declare it.

Widening the scope of this to turn this on for the rest of the code. Also to test out 📌 Setup GitLab CI for Pathologic Needs review

dww → closed merge request !9

Cherry-picked this to 8.x-1.x, too.

Automatically closed - issue fixed for 2 weeks with no activity.