[ci-scan] Skip paltest_pal_sxs_test1 on macOS

[github-actions]

Summary

Disable paltest_pal_sxs_test1 on macOS. The test intermittently hangs due to a Mach exception port / POSIX signal forwarding race on Apple Silicon, resulting in SIGKILL (exit 137) from the test harness.

Linked KBE: #128802
Original tracker: #122345

Reasoning (Step 4.8 verification)

1. Same test? Yes — paltest_pal_sxs_test1 is the exact work item named in both [ci-scan] Test failure: paltest_pal_sxs_test1 Exit code 137 on macOS #128802 and FAILED: exception_handling/pal_sxs/test1/paltest_pal_sxs_test1. Exit code: 137 in outerloop #122345.
2. Same failure mode? Yes — exit code 137 (SIGKILL after hang) on macOS, matching the KBE description.
3. Same platform? Yes — osx-arm64 and osx-x64 in runtime-coreclr outerloop (def 108).
4. Still active? Yes — present in source build 1442311 (May 31) and follow-up build 1442454.

Change

Adds AND NOT CLR_CMAKE_HOST_OSX to the guard in the test's CMakeLists.txt, preventing compilation on macOS while keeping it active on Linux.

Note

🔒 Integrity filter blocked 2 items

The following items were blocked because they don't meet the GitHub integrity level.

• #128392 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #86273 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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