Disable -Wunused-template for clang

[Jacobfaib]

Description

See llvm/llvm-project#219968

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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• cmake/CCCLBuildCompilerTargets.cmake

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Reduced unnecessary compiler warnings during builds where the option is supported.
  • Improved compatibility with current compiler toolchains and GPU kernel builds.

Walkthrough

Changes

Compiler warning configuration

Layer / File(s)	Summary
Unused-template warning configuration cmake/CCCLBuildCompilerTargets.cmake	The CMake configuration checks whether -Wunused-template is available before disabling it for C++ compilation. Comments document LLVM 23 and NVCC GPU kernel call stub behavior.

Suggested reviewers: bernhardmgruber, davebayer, gevtushenko, griwes, jrhemstad

Merge Risk: ⚪ Minimal · up to 569e6

This PR makes a localized compiler-warning configuration change, and no actionable merge-blocking risk remains beyond normal checks and review.

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