[ONNX FE] Added com.microsoft.GroupNorm support and tests.

[nproshun]

Details:

• Added support for com.microsoft.GroupNorm op in onnx frontend
• Added 3 tests: standard mode, with SiLU(Swish) activation, channels_last mode

Tickets:

• CVS-175589

[Copilot]

Pull request overview

This PR adds support for the com.microsoft.GroupNorm operator in the ONNX frontend, enabling the conversion and execution of models using this Microsoft-specific operation.

Changes:

• Implemented GroupNorm operator conversion handling activation (SiLU/Swish) and channels_last mode
• Added three test cases covering standard mode, SiLU activation, and channels_last layout
• Created corresponding ONNX model protobuf definitions for test scenarios

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/frontends/onnx/frontend/src/op/com.microsoft/group_norm.cpp	Implements the GroupNorm operator conversion with support for activation and layout transformations
src/frontends/onnx/tests/onnx_import_com_microsoft.in.cpp	Adds three test cases validating GroupNorm functionality in different configurations
src/frontends/onnx/tests/models/com.microsoft/group_norm.prototxt	Defines ONNX model for standard GroupNorm test
src/frontends/onnx/tests/models/com.microsoft/group_norm_silu.prototxt	Defines ONNX model for GroupNorm with SiLU activation test
src/frontends/onnx/tests/models/com.microsoft/group_norm_channels_last.prototxt	Defines ONNX model for GroupNorm in channels_last layout test

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

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[mvafin]

Looks good. Please fix code style

[nproshun]

Looks good. Please fix code style

@mvafin Done, thanks! Please re-run CI