Add docs for workspace logging

[JimMadge]

:white_check_mark: Checklist

• [x] I have searched open and closed issues for duplicates
• [x] This is a request for a change to documentation
• [x] This isn't a feature request or bug report
• [x] This isn't an open-ended question (open a discussion if it is).

:memo: Required documentation changes

2279 fixed log ingestion for the workspace VMs. However, there is no information in the docs about where to view these logs or how to filter them.

2295 adds some documentation for using Log Analytics and container instances logs. Something similar for workspaces would be good.