feat: Add backup for Datadog Workflows

[finneganhu]

No description provided.

[Copilot]

Pull Request Overview

This PR adds backup functionality for Datadog Workflows to the datadog_backup gem, enabling users to backup and restore workflow configurations.

• Implements a new Workflows class that extends the Resources base class with workflow-specific backup operations
• Adds comprehensive test coverage for the workflows backup functionality
• Integrates the new workflows module into the main library

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
lib/datadog_backup/workflows.rb	Implements the Workflows resource class with backup, retrieval, and API interaction methods
spec/datadog_backup/workflows_spec.rb	Provides comprehensive test coverage for all Workflows class methods and behaviors
lib/datadog_backup.rb	Registers the new workflows module with the main library

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