Harden and correct fifo task queue tests

[qwerty287]

@6543 fails at https://ci.woodpecker-ci.org/repos/3780/pipeline/22623/33

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 27.51%. Comparing base (5e2fa81) to head (29535c7). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4377 +/- ## ========================================== + Coverage 27.46% 27.51% +0.05% ========================================== Files 382 382 Lines 27895 27895 ========================================== + Hits 7660 7676 +16 + Misses 19545 19532 -13 + Partials 690 687 -3 ```

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[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-4377.surge.sh