fix(cuda.core): write NVRTC source to a temp file when debug or lineinfo is enabled

[lijinf2]

Description

closes #2422

When Program compiles C++ with debug=True or lineinfo=True and the caller
does not pass name=, NVRTC recorded the label default_program. That path
does not exist on disk, so cuda-gdb reported No such file or directory.

This change writes the in-memory source to a unique temp file
(caller_py__kernel_XXXXXXXX.cu, mkstemp, mode 0600) and passes that real
path to nvrtcCreateProgram. ProgramOptions.name is left unchanged so the
program cache key is unaffected. An explicit name= still wins. Write
failures fall back to the old label-only behavior. The temp file is removed
on close() / deallocation.

No public API or signature changes.

Checklist

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

[copy-pr-bot]

This pull request requires additional validation before any workflows can run on NVIDIA's runners.

Pull request vetters can view their responsibilities here.

Contributors can view more details about this message here.