Add mobius ep export support

[Xiaoyu (xiaoyu-work)]

This pull request introduces support for specifying a Mobius execution provider profile (such as 'openvino') when using the Mobius model builder, and refactors OpenVINO model handling to consistently register necessary extensions. It also adds tests to ensure the correct behavior of these features.

Mobius execution provider support

• Added a new --execution_provider CLI argument to capture-onnx-graph, allowing users to specify a Mobius execution provider profile when using --use_mobius_builder. The option is validated to ensure it's only used with Mobius builder. [1] [2]
• Updated the Mobius model builder pass to accept an optional execution_provider config parameter, which overrides the profile inferred from the accelerator. [1] [2]
• Added and updated tests to verify correct handling of the execution_provider argument and config, including error cases and override behavior. [1] [2] [3]

OpenVINO extension registration

• Refactored OpenVINO model handler and passes to use a new create_openvino_core utility, which ensures the _GroupQueryAttentionExtension is registered if available. This avoids code duplication and ensures consistent extension registration. [1] [2] [3] [4] [5] [6] [7] [8] [9]
• Added unit tests for create_openvino_core to verify correct extension registration behavior.## Describe your changes

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.

(Optional) Issue link

[Copilot]

Pull request overview

This PR extends Olive’s MobiusBuilder export flow to allow explicitly selecting a Mobius execution provider profile (e.g., "openvino") and centralizes OpenVINO Core creation so required extensions are consistently registered across the OpenVINO model handler and related passes.

Changes:

• Added --execution_provider to capture-onnx-graph (only valid with --use_mobius_builder) and plumbed it into the generated run config.
• Updated MobiusBuilder pass config to accept an optional execution_provider override, taking precedence over the accelerator-inferred profile.
• Introduced create_openvino_core() and refactored OpenVINO handler/passes to use it; added unit tests for both features.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
olive/cli/capture_onnx.py	Adds CLI arg and config wiring for Mobius execution provider profile override.
olive/passes/onnx/mobius_model_builder.py	Adds optional execution_provider pass config and override logic for mobius build.
olive/model/handler/openvino.py	Introduces create_openvino_core() and reuses it for model load/session preparation.
olive/passes/openvino/compression.py	Switches OpenVINO Core creation to create_openvino_core() for consistent extension registration.
olive/passes/openvino/encapsulation.py	Switches OpenVINO Core creation to create_openvino_core().
olive/passes/openvino/io_update.py	Switches OpenVINO Core creation to create_openvino_core().
test/cli/test_cli.py	Adds CLI tests for --execution_provider behavior (valid with mobius builder, rejected otherwise).
test/passes/onnx/test_mobius_model_builder.py	Adds/updates tests for default config and execution provider override behavior.
test/model/test_openvino_model.py	Adds unit tests validating extension registration behavior in create_openvino_core().

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[Xiaoyu (xiaoyu-work)]

Copilot resolve the merge conflicts in this pull request

[Copilot]

Copilot resolve the merge conflicts in this pull request

Resolved in 8e80e3f — merged origin/main and fixed conflicts in mobius_model_builder.py and its test file, keeping both the execution_provider and text_only config options. Verified with the relevant tests and lintrunner.