expand CI-skipping logic, other small build changes

[jameslamb]

Description

Proposes a batch of miscellaneous build / packaging / CI changes.

Changes

Expands CI-skipping logic

Contributes to rapidsai/build-planning#243

Tries to avoid unnecessary CI runs by making the CI-skipping rules finer-grained. For example, PRs that only touch .pre-commit-config.yaml should now not require any runners with GPUs 😁

Removes reliance on pypi.nvidia.com

Contributes to rapidsai/build-planning#241

git grep -i -E 'pypi\.nvidia\.com'
git grep -i -E 'rapids\-init\-pip'

And removed/updated all relevant references. This project does not need any wheels from pypi.nvidia.com at build-time or runtime, it can safely avoid searching that index.

Enforces PEP 639 license metadata in pyproject.toml

Contributes to rapidsai/pre-commit-hooks#95

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[jameslamb]

/ok to test

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Reorganized CI/CD workflow test groups and dependencies for improved pipeline organization.
  • Updated pre-commit hook version to v1.3.3 and added project license verification checks.
  • Enhanced wheel building process configuration to optimize package dependency resolution.
  • Updated pip initialization configuration across build and test scripts for consistent environment setup.

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Walkthrough

The pull request reorganizes CI workflow test groups in pr.yaml, introduces new conda and wheels test workflows, updates pre-commit configuration with a version bump and new hook, and modifies build/test scripts to set RAPIDS_INIT_PIP_REMOVE_NVIDIA_INDEX to "true". NVIDIA pip index entries are removed from dependencies.yaml.

Changes

Cohort / File(s)	Summary
Workflow Configuration .github/workflows/pr.yaml	Reorganized test file inclusion/exclusion patterns; introduced new test groups test_python_conda and test_python_wheels; updated workflow dependencies to reference new conditional outputs; adjusted conditional execution checks for conda-python-tests and wheels-test triggers.
Build and Test Scripts ci/build_wheel.sh, ci/build_wheel_cuforest.sh, ci/build_wheel_libcuforest.sh, ci/test_wheel.sh	Added environment variable RAPIDS_INIT_PIP_REMOVE_NVIDIA_INDEX="true" and exported it before rapids-init-pip initialization in each script, affecting pip index handling during wheel building and testing.
Pre-commit Configuration .pre-commit-config.yaml	Bumped pre-commit hook version from v1.2.1 to v1.3.3; added new verify-pyproject-license hook entry under verify-alpha-spec group with exclusion pattern for top-level pyproject.toml.
Dependencies Configuration dependencies.yaml	Removed global pip index entries for pypi.nvidia.com across multiple dependency blocks while preserving rapidsai-wheels-nightly index entries.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

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[bdice]

/merge