Fix minimal build (make it build with the recent changes)

[yuslepukhin]

This pull request introduces a minor update to the test infrastructure and test files, focusing on improving build configuration and test utility usage.

Build configuration:

• Updated cmake/onnxruntime_test_pch.cmake to only enable precompiled headers for test targets when not performing a minimal build, preventing unnecessary PCH usage in minimal build scenarios.

Test utility improvements:

• Added an include for asserts.h in onnxruntime/test/platform/file_io_test.cc, ensuring test assertions are available and improving test reliability.

[Copilot]

Pull Request Overview

This pull request fixes the minimal build configuration by preventing unnecessary precompiled header (PCH) usage and adding missing test utilities. The changes ensure that minimal builds can complete successfully without PCH overhead while maintaining proper test infrastructure.

• Conditional precompiled header usage for test targets in minimal builds
• Added missing test assertion include to file_io_test.cc

Reviewed Changes

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

File	Description
cmake/onnxruntime_test_pch.cmake	Wraps PCH configuration in minimal build check to prevent PCH usage during minimal builds
onnxruntime/test/platform/file_io_test.cc	Adds missing asserts.h include for test utilities

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