[nextest-runner] make Windows job object termination clearer

[sunshowers]

In case of a Ctrl-C grace period expiring, we should make it clear to users what's happening rather than just printing out "FAIL".

[trunk-io]

     

Failed Test	Failure Summary	Logs
reporter::aggregator::junit::tests::test_set_execute_status_props	The test failed due to a process being aborted with signal 15 (SIGTERM).	Logs ↗︎
reporter::aggregator::junit::tests::test_set_execute_status_props	The test failed due to a process being aborted with signal 15 (SIGTERM).	Logs ↗︎

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 60 lines in your changes missing coverage. Please review.

Project coverage is 80.60%. Comparing base (c612aea) to head (d3fe12a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nextest-runner/src/runner/unix.rs	32.89%	51 Missing ⚠️
nextest-runner/src/runner/executor.rs	0.00%	5 Missing ⚠️
nextest-runner/src/helpers.rs	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1990      +/-   ##
==========================================
+ Coverage   80.59%   80.60%   +0.01%     
==========================================
  Files          95       95              
  Lines       23062    23057       -5     
==========================================
- Hits        18586    18585       -1     
+ Misses       4476     4472       -4     

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