Add a FAIL + LEAK test along with coverage for outputs being displayed

[sunshowers]

Per #1891 -- this bug was quietly fixed but there was no coverage for it apparently.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.64%. Comparing base (4f7d071) to head (8f721be). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
nextest-runner/src/reporter/displayer.rs	66.66%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1892 +/- ## ========================================== - Coverage 79.66% 79.64% -0.02% ========================================== Files 80 80 Lines 20520 20525 +5 ========================================== + Hits 16347 16348 +1 - Misses 4173 4177 +4 ```

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• Flaky Tests Detection - Detect and resolve failed and flaky tests

[trunk-io[bot]]

     

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