[ci-scan] Skip System.Net.Sockets IPv6 tests on Android (refs #127565)

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Reasoning

Five System.Net.Sockets tests fail on Android because IPv6 loopback (::1) connectivity is unavailable in the Android emulator environment used in CI. The failures fall into two categories:

1. DualMode connect tests (DualModeConnect_LoopbackDnsToHost_Helper, DualModeConnect_DnsEndPointToHost_Helper, DualModeConnectAsync_DnsEndPointToHost_Helper) — attempt to connect to ::1 and receive SocketException: Connection refused.
2. Connect_Parallel_FailsOver — the parallel connect fallback test hits the same IPv6 connectivity issue.
3. ConnectAsync_WithBuffer_Succeeds — Assert.False() failure on the socket connection state, linked to the same Android emulator networking limitation.

Each annotation is scoped only to TestPlatforms.Android, matching the exact observed failure scope. Connect_Parallel_FailsOver already had an [ActiveIssue] for iOS/tvOS/MacCatalyst (#124079); a separate [ActiveIssue] line is added for the Android issue (#127565) to keep the two trackers distinct.

KBE verification (4-question check):

1. ✅ Tracker System.Net.Sockets IPv6 dual-mode tests fail on Android with Connection refused #127565 describes the same tests — DualMode IPv6 socket tests on Android.
2. ✅ The tracker's description matches the same failure signature — SocketException: Connection refused on ::1.
3. ✅ The failing OS (Android) matches the tracker's stated scope.
4. ✅ The failing architecture (arm64) matches the tracker's stated scope.

Impact on platforms

• runtime-extra-platforms (def 154) · android-arm64 CoreCLR · Ubuntu.2204.Amd64.Android.29.Open · no stress · exit code 1
  • DualModeConnect_LoopbackDnsToHost_Helper — Connection refused ::1:80
  • DualModeConnect_DnsEndPointToHost_Helper — Connection refused ::1:80
  • DualModeConnectAsync_DnsEndPointToHost_Helper — Connection refused ::1:80
  • Connect_Parallel_FailsOver — Connection refused
  • ConnectAsync_WithBuffer_Succeeds — Assert.False() Failure

Errors log

[FAIL] System.Net.Sockets.Tests.DualModeConnectToHostString.DualModeConnect_LoopbackDnsToHost_Helper
System.Net.Sockets.SocketException : Connection refused [::1]:80

[FAIL] System.Net.Sockets.Tests.SocketAsyncEventArgsTest.Connect_Parallel_FailsOver(preferIPv6: True)
System.Net.Sockets.SocketException : Connection refused

[FAIL] System.Net.Sockets.Tests.SocketBlockingModeTransitionTests.ConnectAsync_WithBuffer_Succeeds
Assert.False() Failure
Expected: False
Actual:   True

First build it occurred

runtime-extra-platforms build 1411505 — finished 2026-05-07. Also present in latest build 1413202. ≥2 occurrences in the scanned window. Note: this is computed within the ~10-build scan window and may not be the true origin.

Linked issue

Linked tracker: #127565

Note

🔒 Integrity filter blocked 2 items

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

• #114222 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #124716 search_pull_requests: 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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