[nextest-runner] remove spurious cancellation check

[codecov[bot]]

Codecov Report

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

Project coverage is 79.66%. Comparing base (b2dfe63) to head (9520464). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1876 +/- ## ======================================= Coverage 79.65% 79.66% ======================================= Files 80 80 Lines 20522 20523 +1 ======================================= + Hits 16347 16349 +2 + Misses 4175 4174 -1 ```

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[trunk-io[bot]]

     

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