{spring-cloud} remove spring-cloud extension as it has been deprecated for years

[evelyn-ys]

customers should use spring extension instead

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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @evelyn-ys,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

The git hooks are available for azure-cli and azure-cli-extensions repos. They could help you run required checks before creating the PR.

Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

pip install azdev --upgrade
azdev setup -c <your azure-cli repo path> -r <your azure-cli-extensions repo path>

[Copilot]

Pull Request Overview

This PR removes the entire spring-cloud extension since it has been deprecated for years.

• All source files, test files, configuration files, and metadata related to the spring-cloud extension have been deleted.
• The removal ensures that customers are directed to use the spring extension instead.

Reviewed Changes

Copilot reviewed 65 out of 422 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/spring-cloud/azext_spring_cloud/tests/...	Removed multiple test files and certificate files
src/spring-cloud/azext_spring_cloud/*.py	Removed core implementation files including spring_cloud_instance.py, gateway.py, service_registry.py, buildpack_binding.py, application_configuration_service.py, and more
src/spring-cloud/azext_spring_cloud/azext_metadata.json	Removed metadata configuration file
src/spring-cloud/azext_spring_cloud/aaz/...	Removed AAZ command group files and related modules
...	Other supporting files have been removed to complete deprecation of the extension

[github-actions]

• For more info about extension versioning, please refer to Extension version schema