[ci-scan] Skip HostTests Moq tests on iossimulator (refs #128405)

[github-actions]

Reasoning

Multiple HostTests tests fail on iossimulator-arm64 CoreCLR with System.IndexOutOfRangeException inside Castle.DynamicProxy.Generators.MethodWithInvocationGenerator.BuildProxiedMethodBody. This is a Castle.DynamicProxy/Moq code-generation bug specific to the iOS simulator CoreCLR environment. The existing IsReflectionEmitSupported condition passes on iossimulator (RefEmit is supported there), but Castle's internal codegen hits an array bounds issue.

Adding [ActiveIssue] with TestPlatforms.iOS is the narrowest scope that matches the observed failure.

Linked KBE: dotnet#128405

Match verification (from Step 4.8):

1. Same test/family: Yes - all 7 tests are in Microsoft.Extensions.Hosting.Internal.HostTests and use Moq
2. Same failure signature: Yes - System.IndexOutOfRangeException : Index was outside the bounds of the array. in Castle.DynamicProxy.Generators.MethodWithInvocationGenerator.BuildProxiedMethodBody
3. Same OS: Yes - iossimulator (maps to TestPlatforms.iOS)
4. Same architecture: Yes - arm64

Impact on platforms

• runtime-extra-platforms (def 154) / iossimulator-arm64 Release AllSubsets_CoreCLR / ubuntu2204-amd64 queue / no stress mode / exit code 1

Errors log

[FAIL] Microsoft.Extensions.Hosting.Internal.HostTests.Dispose_DisposesHostConfigurationProviders
System.IndexOutOfRangeException : Index was outside the bounds of the array.
   at Castle.DynamicProxy.Generators.MethodWithInvocationGenerator.BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter class, INamingScope namingScope)
   at Castle.DynamicProxy.Generators.MethodGenerator.Generate(ClassEmitter class, INamingScope namingScope)
   at Castle.DynamicProxy.Contributors.CompositeTypeContributor.ImplementMethod(MetaMethod method, ClassEmitter class, OverrideMethodDelegate overrideMethod)

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1425947
• Finished: 2026-05-19T09:03:10Z
• Occurrences in window: 9+ (every build since 2026-05-19)
• Computed within the scanned window; may not be the true origin.

Linked issue

dotnet#128405

Note

🔒 Integrity filter blocked 1 item

The following item was blocked because it doesn't meet the GitHub integrity level.

• #125825 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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