drop using dockers

[Borda]

What does this PR do?

since the litCI does not use these pre-build images and Azure is going to be deprecated, there is no need to preserve this docker builds and updates

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📚 Documentation preview 📚: https://pytorch-lightning--21190.org.readthedocs.build/en/21190/

[Copilot]

Pull Request Overview

This PR removes all Docker-related infrastructure and CI configurations as they are no longer needed since litCI doesn't use pre-built images and Azure infrastructure is being deprecated.

• Removes all Docker configuration files (Dockerfiles and README)
• Updates CI configuration to remove Docker-related labeling and checks
• Eliminates Docker build workflows from the required CI checks

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
dockers/release/Dockerfile	Removed Docker configuration for release builds
dockers/nvidia/Dockerfile	Removed NVIDIA-specific Docker configuration
dockers/docs/Dockerfile	Removed documentation Docker configuration
dockers/base-cuda/Dockerfile	Removed base CUDA Docker configuration
dockers/README.md	Removed Docker documentation
.github/label-change.yml	Removed "dockers" label configuration for automated labeling
.github/checkgroup.yml	Removed Docker build checks from required CI workflows

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[github-actions]

⚡ Required checks status: All passing 🟢

No groups match the files changed in this PR.

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Thank you for your contribution! 💜

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