Merge Enhanced rollback and deployment progress tracking

[LuiseFreese]

This pull request updates the docs/DEVELOPER_ARCHITECTURE.md file with several improvements and additions. The main focus is on enhancing the documentation for the application's architecture, including more accurate directory diagrams, improved clarity of system flows, and a comprehensive new section detailing the rollback system for Dataverse deployments. Additionally, the update fixes encoding issues in diagrams and descriptions for better readability.

Most important changes:

Documentation Enhancements:

• Added a detailed section describing the new rollback system, including its purpose, architecture, process flow, API endpoints, error handling, frontend integration, and security considerations. This provides a thorough guide for implementing and understanding rollback functionality in Dataverse deployments.
• Improved and clarified the directory structure diagrams for all major modules (backend, file upload, solution setup, global choices, deployment), now using visually accurate box-drawing characters for better readability and consistency. [1] [2] [3] [4] [5]

Encoding and Formatting Fixes:

• Fixed encoding issues in diagrams and flow descriptions (e.g., replacing incorrect arrow characters with the correct ones) to improve clarity and ensure proper rendering across platforms. [1] [2] [3] [4] [5]

Minor Content Updates:

• Updated deployment and rollback progress tracking descriptions to reflect enhanced real-time feedback and user experience improvements. [1] [2]
• Removed stray or incomplete JSON examples from the global choices API documentation section for clarity.

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