project_browser_test.time service tests fail on 10.3

(With help from richard thomas and mstrelan in Slack) in 10.3 the time service is added to cache.backend.database this causes the loop. Quote "
decorated version requires state it causes the loop, because state then requires the cache which requires datetime.time again".

Calling this major because 10.3 is already beta.

So technically this is a part of 📌 GitLab CI - test for previous and next minor versions, and maximum PHP version Needs review which I uncovered because i'm daft. So I've rebased/summarised that issue too and made this a child.

Fixed differently in HEAD.