NPU Whisper switch to use stateful pipeline by default

[eshiryae]

Description

E-190314

Checklist:

• Tests have been updated or added to cover the new code.
• This patch fully addresses the ticket.
• I have made corresponding changes to the documentation.

[Copilot]

Pull request overview

This PR switches the NPU Whisper pipeline to use the stateful pipeline by default instead of the static pipeline. The change involves reversing the default value of the STATIC_PIPELINE configuration option from true to false.

Key Changes:

• Modified the default value of STATIC_PIPELINE from true to false in the WhisperPipeline implementation
• Updated test configuration to explicitly set STATIC_PIPELINE to "YES" to maintain existing test behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/cpp/src/whisper/pipeline.cpp	Changed default value of STATIC_PIPELINE from true to false
tests/python_tests/test_whisper_pipeline_static.py	Added explicit STATIC_PIPELINE configuration to preserve static pipeline testing

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.