Add Security Data Scanner findings to AI Guard result

[y9v]

What does this PR do?
This PR adds sds_findings to AIGuard::Evaluation::Result, and adds SDS findings to the ai_guard metastruct tag.

Motivation:
The AI Guard evaluation API now returns sensitive data scanner results in sds_findings attribute.

Change log entry
Yes. AI Guard: Add AIGuard::Evaluation::Result#sds_findings method for getting matched Sensitive Data Scanner results.

Additional Notes:
APPSEC-61446

How to test the change?
CI and manual testing with appsec-app-generator.

[github-actions]

Typing analysis

Note: Ignored files are excluded from the next sections.

steep:ignore comments

This PR introduces 1 steep:ignore comment, and clears 1 steep:ignore comment.

steep:ignore comments (+1-1)

❌ Introduced:

lib/datadog/ai_guard/evaluation.rb:65

✅ Cleared:

lib/datadog/ai_guard/evaluation.rb:64

Untyped methods

This PR introduces 1 partially typed method, and clears 1 partially typed method.

Partially typed methods (+1-1)

❌ Introduced:

sig/datadog/ai_guard/evaluation/result.rbs:28
└── def initialize: (::Hash[::String, untyped] raw_response_body) -> void

✅ Cleared:

sig/datadog/ai_guard/evaluation/result.rbs:15
└── def initialize: (::Hash[::String, untyped] raw_response_body) -> void

If you believe a method or an attribute is rightfully untyped or partially typed, you can add # untyped:accept on the line before the definition to remove it from the stats.

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 85.19%
• Overall Coverage: 95.42% (+0.05%)

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