Enable reusable Windows image publishing for CCCL

[jrhemstad]

Summary

• expose the existing Windows release workflow through workflow_call with a caller-provided image repository
• explicitly check out the devcontainers workflow source for cross-repository calls
• retain Docker Hub authentication for native releases and use the caller's GITHUB_TOKEN for ghcr.io/*
• preserve the existing Windows matrix, runner selection, build/test/push flow, concurrency, and tag generation

This is the prerequisite for a SHA-pinned workflow in NVIDIA/cccl to publish private Windows images to ghcr.io/nvidia/cccl.

[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.