remove dask dependencies and configuration, reduce duplication in dependencies.yaml

[jameslamb]

Description

Follow up to #723

Makes some other changes to packaging configuration to reduce duplication and remove unused dependencies.

• removes all remaining Dask / raft-dask dependencies and configuration (missed in Remove raft-dask dependency #475)
• uses more YAML anchors and depends_on_{package} groups in dependencies.yaml to reduce duplication

Issue

N/A

Notes for Reviewers

How I found these Dask changes

Noticed rapids-dask-dependency in dependencies.yaml and I was surprised, as I thought cuOpt did not use Dask for anything.

Did this to find all the references and confirm there were no Dask-related direct imports in Python code here:

git grep -i dask

Then I searched the history and found #475. Noticed it had not updated the conda recipes or some of this other configuration.

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
• Documentation
  • The documentation is up to date with these changes

Summary by CodeRabbit

Release Notes

• Chores
  • Removed rapids-dask-dependency and raft-dask from project dependencies across multiple environment configurations, simplifying the dependency tree.
  • Updated copyright year to 2025-2026.
  • Adjusted import grouping configuration for improved import organization.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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[jameslamb]

/ok to test

[rgsl888prabhu]

/merge