Use the default retention time for CI artifacts
The instance-wide GitLab CI artifact retention time was changed to 1 day up from the previous value of 12 hours. Remove our explicit overrides for 1 day artifact retention time, as it is the default now.
Previously, most of our jobs had overrides for 1 day retention, while some of our jobs used the default 12 hours. This discrepancy could be quite impractical at times.
The default artifacts retention time was changed to 1 day on 2023-03-09.