Add gtest support for Sunway builds

[A-006]

Summary:

• Add a Sunway-specific gtest build script and documentation under tools.
• Update CMake test definitions to better handle Sunway constraints and selective test enabling.
• Register additional unit test CMakeLists for hsolver and LCAO RT modules.

Files Changed:

• CMakeLists.txt
• source/source_base/module_container/ATen/kernels/test/CMakeLists.txt
• source/source_base/module_container/test/CMakeLists.txt
• source/source_hsolver/test/CMakeLists.txt
• source/source_lcao/module_rt/test/CMakeLists.txt
• tools/README.md
• tools/gtest_on_sunway/gtest_on_sunway.sh

Testing:

• Not run (please confirm if you ran any tests)

[Copilot]

Pull request overview

Adds infrastructure to enable building/running GoogleTest-based unit tests on Sunway (USE_SW) builds, while selectively disabling known-problematic tests and aligning link dependencies for the platform.

Changes:

• Add a Sunway-focused script and tooling docs for building ABACUS with a local/offline GoogleTest.
• Adjust CMake test registration to skip specific unit test targets on USE_SW.
• Refactor USE_SW math/ScaLAPACK linkage setup to better unify dependencies across main targets and tests.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
CMakeLists.txt	Appends Sunway math libs to math_libs and introduces a USE_SW ScaLAPACK::ScaLAPACK fallback target.
source/source_base/module_container/ATen/kernels/test/CMakeLists.txt	Skips container kernel unit tests on USE_SW.
source/source_base/module_container/test/CMakeLists.txt	Skips container unit tests on USE_SW.
source/source_hsolver/test/CMakeLists.txt	Skips a subset of HSOLVER tests on USE_SW (with a warning).
source/source_lcao/module_rt/test/CMakeLists.txt	Skips RT-TDDFT unit tests on USE_SW.
tools/README.md	Documents the new gtest_on_sunway tooling directory.
tools/gtest_on_sunway/gtest_on_sunway.sh	New script to build/install local GoogleTest and configure ABACUS tests offline.

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