Update hybrid architecture diagram (#24189)

## Summary & Motivation
Updated the hybrid architectural diagram to include the customer's git
repository and container registry. Additionally, simplified the Dagster+
environment to include fewer implementation details.

## How I Tested These Changes
Tested locally
<img width="1717" alt="updated_hybrid_diagram"
src="https://github.com/user-attachments/assets/922e57dc-6c52-4b18-b43c-2ad518c6f3e9">

## Changelog [New | Bug | Docs]

`NOCHANGELOG`