Fix intermittent failures in PAL tests

[jkotas]

Fixing regression introduced by #115877. The lowres timestamp has a rounding error that makes the test fail intermittently. Switch back to highres timestamp.

[Copilot]

Pull Request Overview

This PR updates several PAL threading tests to use high-resolution tick measurements and converts raw tick deltas into milliseconds to reduce timing-related test flakiness.

• Replaced minipal_lowres_ticks() with minipal_hires_ticks()
• Divided tick differences by (minipal_hires_tick_frequency() / 1000) to produce millisecond values
• Applied these changes consistently across WaitForSingleObject, WaitForMultipleObjectsEx, SleepEx, and Sleep test cases

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/coreclr/pal/tests/palsuite/threading/WaitForSingleObject/WFSOExThreadTest/WFSOExThreadTest.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/WaitForSingleObject/WFSOExSemaphoreTest/WFSOExSemaphoreTest.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/WaitForSingleObject/WFSOExMutexTest/WFSOExMutexTest.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/WaitForMultipleObjectsEx/test2/test2.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/SleepEx/test2/test2.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/SleepEx/test1/test1.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/Sleep/test2/sleep.cpp	Swap low-res ticks for high-res and convert to ms
src/coreclr/pal/tests/palsuite/threading/Sleep/test1/Sleep.cpp	Swap low-res ticks for high-res and convert to ms

[jkotas]

Example of a failure: https://helix.dot.net/api/2019-06-17/jobs/30c36749-2cf4-4fa9-a5bb-71292b5a72a4/workitems/PALTests/console

...................Expected thread to wait for 4000 ms (and not be interrupted).
Thread waited for 3997 ms! (Acceptable delta: 300)

[jkotas]

/azp run runtime-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jkotas]

cc @huoyaoyuan

[AaronRobinsonMSFT]

Le sigh... Thank you.

[jkotas]

/ba-g known issue #115640