[ci-scan] Skip StackReferenceDumpTests on arm dumps (refs #128292)

[github-actions]

Reasoning

StackReferenceDumpTests.WalkStackReferences_ReturnsWithoutThrowing and WalkStackReferences_RefsHaveValidSourceInfo fail with VirtualReadException : Failed to read System.UInt32 when processing linux_arm dumps via R2R ReadyToRunJitManager.GetExceptionClauses. The [SkipOnArch("arm", ...)] attribute is the narrowest available condition, matching how these dump tests already skip x86.

Linked KBE: dotnet#128292

Match verification (from Step 4.8):

1. Same test/family: yes — StackReferenceDumpTests.WalkStackReferences_ReturnsWithoutThrowing and WalkStackReferences_RefsHaveValidSourceInfo
2. Same failure signature: yes — VirtualReadException : Failed to read System.UInt32
3. Same OS: yes — linux_arm dumps (processed from all host platforms)
4. Same architecture: yes — arm dumps specifically

Impact on platforms

• runtime-diagnostics (def 309) / windows-x64 release CdacXPlatDumpTest — exit code 1
• runtime-diagnostics (def 309) / windows-x86 release CdacXPlatDumpTest — exit code 1
• runtime-diagnostics (def 309) / linux-x64 release CdacXPlatDumpTest — exit code 1
• runtime-diagnostics (def 309) / windows-arm64 release CdacXPlatDumpTest — exit code 1

Errors log

Microsoft.Diagnostics.DataContractReader.DumpTests.StackReferenceDumpTests.WalkStackReferences_ReturnsWithoutThrowing(config: local/r2r (linux_arm)) [FAIL]
      Microsoft.Diagnostics.DataContractReader.VirtualReadException : Failed to read System.UInt32 at 0xf01965f0.
        at Microsoft.Diagnostics.DataContractReader.Data.ExceptionLookupTableEntry..ctor(Target target, TargetPointer address)
        at Microsoft.Diagnostics.DataContractReader.Contracts.ExecutionManagerCore`1.ReadyToRunJitManager.GetExceptionClauses(...)
   Microsoft.Diagnostics.DataContractReader.DumpTests  Total: 424, Errors: 0, Failed: 2, Skipped: 200

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1423045
• Finished: 2026-05-16T05:17:26Z
• Occurrences in window: 5+ (persistent across all scanned builds)
• Computed within the scanned window; may not be the true origin.

Linked issue

dotnet#128292

Note

🔒 Integrity filter blocked 1 item

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

• #105207 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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