[release/8.0-staging] Disable RSA SHA1/384 signature tests on Android

[Copilot]

/cc @vcsjones @bartonjs

Customer Impact

• Customer reported
• Found internally

Disabled tests for #134002. The actual fix would likely not meet the back port bar for .NET 8, so let's disable the tests on Android.

Regression

• Yes
• No

Testing

We're disabling tests for .NET 8.0 on Android that do not pass and the fix is unlikely to meet back port threshold.

Risk

None. Test-only disablement.

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[Copilot]

🟡 Changes recommended

A related Android RSA-384/SHA-1 verification test remains enabled and may still fail.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Disables known failing Android RSA SHA-1/RSA-384 tests related to issue #134002.

Changes:

• Marks ExpectedSignature_SHA1_384 as an Android active issue.
• Marks VerifySignature_SHA1_384 as an Android active issue.

File summaries

File	Summary
src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/RSA/SignVerify.cs	Adds Android-specific issue annotations to two RSA-384/SHA-1 tests.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[Copilot]

🟢 Approval recommended

The reviewed changes are test-only Android disablements with no unresolved blocking issues.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Lite

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[bartonjs]

Test-only change

[vcsjones]

/ba-g failures are unrelated

[vcsjones]

/backport to release/9.0-staging

[github-actions]

Started backporting to release/9.0-staging (link to workflow run)