Modularize workflows by creating reusable GitHub Actions

[mamu0]

This PR introduces some new GitHub Actions and modifies existing workflows to use them. The main goal was to reduce code duplication across workflows by extracting common functionality into reusable actions.

Actions created:

• azure-login: For standardized authentication with Azure
• terraform-setup: For Terraform version configuration
• upload-artifact: For uploading artifacts in pipelines
• download-artifact: For downloading artifacts in pipelines
• node-setup: For configuring Node.js environment
• get-all-modules and get-modified-modules: For managing Terraform modules
• slack-notification: For sending on slack channel a notification

Other changes:

• Improved get-terraform-version action with new terraform version input
• renamed cdn-code-deploy to maintein convention
• deleted get_terraform_version.yaml, get_all_modules.yaml and get_modified_modules.yaml workflow to use new actions

Benefits:

• Easier maintenance: changes in a single point instead of multiple workflows (E.g. the commit sha)
• Consistent behavior across different workflows
• Cleaner and more readable code
• Easier to add new workflows that reuse the same functionality

Resolves: CES-737

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Latest commit: e9c6ffe

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[gunzip]

question: are the deleted files referenced somewhere?

[mamu0]

question: are the deleted files referenced somewhere?

no, two were used improperly, as they were two actions made as workflow, so I converted and replaced them, one was unused and had already been converted back into an action