Align DeepgramSageMakerSTTService finalize pattern with DeepgramSTTService

[markbackman]

Summary

• Align DeepgramSageMakerSTTService transcription and finalize handling with the patterns used in DeepgramSTTService
• Add request_finalize() / confirm_finalize() tracking for proper finalize lifecycle
• Use is_final (not is_final and speech_final) as the condition for final transcriptions, matching the regular Deepgram service

Test plan

• Verify final transcriptions are correctly detected with is_final check
• Verify request_finalize() is called before sending the Finalize message
• Verify confirm_finalize() is called when from_finalize is present in the response

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pipecat/services/deepgram/stt_sagemaker.py	0.00%	6 Missing ⚠️

Files with missing lines	Coverage Δ
src/pipecat/services/deepgram/stt_sagemaker.py	0.00% <0.00%> (ø)

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[filipi87]

LGTM!