[QNN EP] Add support for handling 0-dimension for Concat Op

[qti-ashwshan]

Description

• Added dedicated ConcatOpBuilder to handle tensors with 0-dimension
• Added unit tests for testing 0-dim inputs to Concat
• Removed existing logic for concat from base op builder

Motivation and Context

• Currently 0- dims for Concat is not handled in QNN EP

[qti-ashwshan]

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[qti-ashwshan]

Can we run CI for this change - @yuslepukhin . This is needed for bf16 models

[Copilot]

Pull request overview

This PR adds dedicated support for handling tensors with 0-dimensions in the Concat operation for the QNN execution provider. Previously, the logic was embedded in the base op builder with limited functionality.

Changes:

• Created a new dedicated ConcatOpBuilder that filters out inputs with 0-dimensions before passing them to QNN
• Removed the generic 0-dimension handling logic from the base op builder
• Added unit tests for both runtime inputs and initializers with 0-dimensions

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
concat_op_builder.cc	New dedicated op builder that filters inputs with 0-dimensions and validates at least one valid input exists
base_op_builder.cc	Removed the generic DoesConcatInputShapeContainZero function and its usage from ProcessInputs
op_builder_factory.h	Added CreateConcatOpBuilder function declaration
op_builder_factory.cc	Updated registration to use ConcatOpBuilder instead of SimpleOpBuilder
simple_op_htp_test.cc	Added two test cases for empty input and empty initializer scenarios

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[qti-ashwshan]

Rebased main to get latest fix for test failures - @yuslepukhin

[qti-ashwshan]

@adrianlizarraga - Could we run CI on this PR as well. This is also needed for cherry pick

[edgchen1]

/azp run Linux QNN CI Pipeline, Win_TRT_Minimal_CUDA_Test_CI, Windows ARM64 QNN CI Pipeline, Windows GPU Doc Gen CI Pipeline

[azure-pipelines]

Azure Pipelines successfully started running 4 pipeline(s).

[qti-ashwshan]

@adrianlizarraga - Ready for merge