test(sns): Improve SNS service tests

[CodeBeaverAI]

CodeBeaver PR Summary

Hi! I'm an AI agent that writes, maintains and runs Unit Tests. I do that for free for open source repos.

I started working from fix(aws): sns_service threw IndexError if SubscriptionArn is PendingConfirmation and I worked to improve stability.

🔄 1 test added.
🐛 No bugs detected in your changes
🛠️ 1/1 tests passed

🔄 Test Updates

I've added 1 tests. They all pass ☑️
New Tests:

• tests/providers/aws/services/sns/sns_service_test.py

No existing tests required updates.

🐛 Bug Detection

No bugs detected in your changes. Good job!

🛠️ Test Results

All 1 tests passed.

☂️ Coverage Improvements

Coverage improvements by file:

• tests/providers/aws/services/sns/sns_service_test.py

  New coverage: 94.67%
  Improvement: +10.67%

🎨 Final Touches

• I ran the hooks included in the pre-commit config.

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