Show runtime for interrupted tests

[JaySon-Huang]

Summary

Hi! This is a small improvement to make interrupted tests easier to diagnose.

When a test run is stopped early (for example with Ctrl+C), the INTERRUPTED TESTS summary currently only shows the test name, without how long it had been running. That makes it harder to tell whether a test was interrupted near the start or after running for a long time.

This change records the elapsed time before the worker thread exits on interruption, and includes it in the summary output.

Before:

INTERRUPTED TESTS (1/3380):
Interrupted: /tiflash/gtests_dbms ComputeServerRunner.runAggTasks

After:

INTERRUPTED TESTS (1/3380):
Interrupted: 1078216 ms: /tiflash/gtests_dbms ComputeServerRunner.runAggTasks

Changes

• Record runtime_ms in Task.run() when ProcessWasInterrupted is raised (before thread.exit()).
• Update print_tests() to show Interrupted: <ms> ms for interrupted tests when runtime is available.
• Add unit tests for both behaviors.

Test plan

• python3 -m unittest gtest_parallel_tests -v
• Verified interrupted test output format via test_print_interrupted_tests_shows_runtime

Happy to adjust the output format or naming if you have a preference. Thanks for maintaining this project!

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