[ci-scan] Skip DnsGetHostAddresses_LocalhostSubdomainWithTrailingDot on Android (refs #127965) (#127983)

## Reasoning

The test
`DnsGetHostAddresses_LocalhostSubdomainWithTrailingDot_ReturnsLoopback`
fails on Android because the Android emulator DNS resolver returns
link-local and globally-routable IPv6 addresses for `.localhost`
subdomain queries (`foo.localhost.`, `bar.test.localhost.`) instead of
loopback addresses. This is a platform DNS resolver behavior difference
(Android does not honor RFC 6761 §6.3 for subdomains of localhost), not
a .NET product bug. The `[ActiveIssue]` annotation on
`TestPlatforms.Android` is the correct narrowly-scoped muting for this
failure.

**KBE verification (four questions):**
1. Same test? Yes —
`DnsGetHostAddresses_LocalhostSubdomainWithTrailingDot_ReturnsLoopback`.
2. Same failure signature? Yes — `Assert.All() Failure: ... Expected
loopback address but got: fe80::...`.
3. Same OS? Yes — Android.
4. Same architecture? Yes — all Android architectures (arm64, x64, x86).

## Impact on platforms

- runtime-extra-platforms (def 154) + android-arm64 Mono +
Windows.11.Amd64.Android.Open + no stress + exit code 1
- runtime-extra-platforms (def 154) + android-x64 Mono +
Windows.11.Amd64.Android.Open + no stress + exit code 1
- runtime-extra-platforms (def 154) + android-arm64 CoreCLR +
Windows.11.Amd64.Android.Open + no stress + exit code 1
- runtime-extra-platforms (def 154) + android-x64 CoreCLR +
Windows.11.Amd64.Android.Open + no stress + exit code 1

## Errors log

```
[FAIL] System.Net.NameResolution.Tests.GetHostAddressesTest.DnsGetHostAddresses_LocalhostSubdomainWithTrailingDot_ReturnsLoopback(hostName: "foo.localhost.")
Assert.All() Failure: 6 out of 7 items in the collection did not pass.
[1]: Item:  fe80::cc6b:b5ff:fe9c:4dde%30
     Error: Expected loopback address but got: fe80::cc6b:b5ff:fe9c:4dde%30
```

## First build it occurred

First seen in build
[1411505](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1411505)
(2026-05-07) within the scanned window. Also present in
[1413202](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1413202).
This is computed within the scanned window and may not be the true
origin.

## Linked issue

Linked KBE: #127965




> [!NOTE]
> <details>
> <summary>🔒 Integrity filter blocked 19 items</summary>
>
> The following items were blocked because they don't meet the GitHub
integrity level.
>
> - [#125901](#125901)
`search_pull_requests`: has lower integrity than agent requires. The
agent cannot read data with integrity below "approved".
> - [#122311](#122311)
`search_pull_requests`: has lower integrity than agent requires. The
agent cannot read data with integrity below "approved".
> - [#114055](#114055)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#120891](#120891)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#84006](#84006)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#112841](#112841)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#83317](#83317)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#51317](#51317)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#86416](#86416)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#90084](#90084)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#77241](#77241)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#115319](#115319)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#93768](#93768)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#96506](#96506)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#90803](#90803)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - [#126682](#126682)
`search_issues`: has lower integrity than agent requires. The agent
cannot read data with integrity below "approved".
> - ... and 3 more items
>
> To allow these resources, lower `min-integrity` in your GitHub
frontmatter:
>
> ```yaml
> tools:
>   github:
>     min-integrity: approved  # merged | approved | unapproved | none
> ```
>
> </details>


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---------

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Author: github-actions[bot]

src/libraries/System.Net.NameResolution/tests/FunctionalTests/GetHostAddressesTest.cs

@@ -308,6 +308,7 @@ public async Task DnsGetHostAddresses_LocalhostAndSubdomain_BothReturnLoopback()
         }
 
         // RFC 6761: Localhost subdomains with trailing dot should work (e.g., "foo.localhost.")
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/127965", TestPlatforms.Android)]
         [Theory]
         [InlineData("foo.localhost.")]
         [InlineData("bar.test.localhost.")]