[ci-scan] Skip ActivityTracking tests on Android Mono (refs #129088)

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Reasoning

The BasicEventSourceTests.ActivityTracking tests consistently fail on Android when running on the Mono runtime because the Activity ID remains as all-zeros Guid after EventSource Start/Stop operations. On Android with Mono, the threading/activity context does not propagate as expected, causing Assert.NotEqual(Guid.Empty, ...) to fail.

The fix narrows the [ActiveIssue] condition to Android + Mono only by using PlatformDetection.IsAndroid together with PlatformDetection.IsMonoRuntime. All four affected tests share the same root cause, and the updated skip scope now matches the failing legs more precisely than the original Android-wide condition.

Linked KBE: #129088

Match verification (from Step 4.8):

1. Same test/family: yes — BasicEventSourceTests.ActivityTracking.StartStopCreatesActivity and 3 sibling tests
2. Same failure signature: yes — Assert.NotEqual() Failure: Values are equal with Expected Not 00000000-0000-0000-0000-000000000000
3. Same OS/runtime combination: yes — Android on Mono
4. Same architecture: yes — all affected Android Mono architectures

Impact on platforms

• runtime-extra-platforms (def 154) / android-arm Release AllSubsets_Mono / Windows.11.Amd64.Android-armel.Open / exit code 1
• runtime-extra-platforms (def 154) / android-x64 Release AllSubsets_Mono / Windows.11.Amd64.Android-x64.Open / exit code 1
• runtime-extra-platforms (def 154) / android-arm64 Release AllSubsets_Mono / exit code 1
• runtime-extra-platforms (def 154) / android-x86 Release AllSubsets_Mono / exit code 1

Errors log

[FAIL] BasicEventSourceTests.ActivityTracking.StartStopCreatesActivity
Assert.NotEqual() Failure: Values are equal
Expected: Not 00000000-0000-0000-0000-000000000000
Actual:       00000000-0000-0000-0000-000000000000
   at BasicEventSourceTests.ActivityTracking.StartStopCreatesActivity()

[FAIL] BasicEventSourceTests.ActivityTracking.ActivityFlowsAsync
[FAIL] BasicEventSourceTests.ActivityTracking.SetCurrentActivityIdBeforeEventFlowsAsync
[FAIL] BasicEventSourceTests.ActivityTracking.SetCurrentActivityIdAfterEventDoesNotFlowAsync

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1449088
• Finished: 2026-06-04T09:47:08Z
• Occurrences in window: 4+ (builds 1449088, 1450787, 1452386, 1452872)
• Computed within the scanned window; may not be the true origin.

Linked issue

#129088

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Filed by ci-failure-scan, which scans dnceng-public outer-loop pipelines on main and converts stable failures into KBEs and test-disable PRs. Comment here or on the workflow file to suggest changes; ci-failure-scan-feedback reads in-scope feedback daily and opens (or updates) a PR with prompt edits.

> [!NOTE]
>

> Generated by CI Outer-Loop Failure Scanner · ● 38.1M · ◷

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Tagging subscribers to 'arch-android': @vitek-karas, @simonrozsival, @steveisok, @akoeplinger
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Pull request overview

This PR updates System.Diagnostics.Tracing ActivityTracking unit tests to be skipped only on Android when running on the Mono runtime, by adding a new [ActiveIssue] condition that requires both PlatformDetection.IsAndroid and PlatformDetection.IsMonoRuntime.

Changes:

• Add a new [ActiveIssue] attribute to the four failing BasicEventSourceTests.ActivityTracking tests.
• Gate the skip specifically to the IsAndroid && IsMonoRuntime combination (multiple conditions within one [ActiveIssue] are combined with && in the test wrapper generator).