chore(CI): remove dead Azure GPU pipelines

[Borda]

What does this PR do?

This pull request removes all Azure Pipeline CI/CD workflows related to GPU-based testing, integration, and cache management. The deleted files are .azure/gpu-unittests.yml, .azure/gpu-integrations.yml, and .azure/gpu-nuke-cache.yml. These files previously defined jobs for running GPU-based unittests, integration tests, and cache cleanup on Azure infrastructure.

The most important changes are:

Removal of GPU-based CI/CD workflows:

• Deleted .azure/gpu-unittests.yml, which contained jobs for running GPU-based unittests on multiple PyTorch versions, including environment setup, test execution, and cache management.
• Deleted .azure/gpu-integrations.yml, which defined integration testing jobs for different PyTorch and CUDA versions using GPU resources.

Removal of GPU cache maintenance workflow:

• Deleted .azure/gpu-nuke-cache.yml, which scheduled and triggered jobs to clear shared GPU caches and artifacts on a monthly basis or when the file was changed in a PR.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

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[Copilot]

Pull request overview

This PR removes obsolete Azure GPU CI/CD pipeline definitions from the repository, consistent with the goal of dropping dead Azure GPU workflows while GPU-related workflow coverage appears to exist elsewhere.

Changes:

• Deleted Azure GPU unittest pipeline.
• Deleted Azure GPU integration pipeline.
• Deleted Azure GPU cache cleanup pipeline.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.azure/gpu-unittests.yml	Removes the Azure GPU unittest workflow and related cache/test setup.
.azure/gpu-integrations.yml	Removes the Azure GPU integration testing workflow.
.azure/gpu-nuke-cache.yml	Removes the Azure GPU cache cleanup workflow.

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