Add cuDNN discovery and NCCL header support

[DEKHTIARJonathan]

Description

No linked issue; this change adds requested cuda-pathfinder support for cuDNN and NCCL.

• Add cuDNN 9 dynamic-library discovery for Linux x86_64/aarch64 and Windows x64.
• Add cuDNN header discovery on Linux and Windows.
• Add NCCL header discovery on Linux; NCCL dynamic-library and device-bitcode discovery already exist.
• Add cuDNN CUDA 12/13 test dependencies and update the conda test-environment helpers.
• Add catalog metadata tests and validate the supplied cuDNN, cuSPARSELt, and NCCL wheel layouts.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes (no public API additions).

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[Copilot]

Pull request overview

This pull request extends cuda_pathfinder’s component discovery catalog to cover cuDNN (shared libraries + headers) and NCCL headers, and wires those additions into the test/dependency setup used for validating wheel and conda layouts.

Changes:

• Add cuDNN dynamic-library descriptor metadata for Linux and Windows, plus a catalog test to validate expected wheel layout metadata.
• Add header descriptor metadata for cuDNN (Linux/Windows) and NCCL (Linux-only), plus a test to validate header metadata against expected wheel layouts.
• Update pathfinder conda test-environment helpers and cuda_pathfinder test dependency groups to include cuDNN (and NCCL on Linux).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
toolshed/conda_create_for_pathfinder_testing.sh	Add cudnn and nccl to the Linux conda-based test environment packages.
toolshed/conda_create_for_pathfinder_testing.ps1	Add cudnn to the Windows conda-based test environment packages.
cuda_pathfinder/tests/test_find_nvidia_headers.py	Extend non-CTK distribution metadata patterns for cuDNN/NCCL and add a header descriptor layout test.
cuda_pathfinder/tests/test_descriptor_catalog.py	Add a descriptor-catalog test validating cuDNN wheel layout metadata.
cuda_pathfinder/pyproject.toml	Add nvidia-cudnn-cu12 / nvidia-cudnn-cu13 to the CUDA test dependency groups.
cuda_pathfinder/cuda/pathfinder/_headers/header_descriptor_catalog.py	Add header descriptor specs for cudnn and nccl.
cuda_pathfinder/cuda/pathfinder/_dynamic_libs/descriptor_catalog.py	Add a cuDNN dynamic-library descriptor spec for discovery on Linux/Windows.

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