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Upgrading Power BI Workspace: Content Pack Warning Message
That's a lot of work. Hope the below suggestion helps you!
To see the associated content pack of a classic workspace, you can navigate to the workspace > click on settings at the top of nav bar > View Content Pack
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When you are in a workspace, you should see an option at the top right corner which says Create App or Update App.
If you see update app there, it means that there is a dependant app on that workspace and it could be the reason why you are seeing that warning.
You can unpublish the app and try to upgrade again and see if that works!
Refernce: Upgrade classic workspaces to the new workspaces - Power BI | Microsoft Docs
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