Refactor the workspace SSH command syntax across the project to use the
"workspace.coder" format instead of "coder.workspace". This standardizes
the SSH host entries for better consistency and clarity.
This is a follow-up from #17445 and recommends using the suffix-based
format for all new Coder versions.
<img width="418" alt="image"
src="https://github.com/user-attachments/assets/3893f840-9ce1-4803-a013-736068feb328"
/>
