* Remove Microsoft.CodeAnalysis.CSharp from Infrastructure project
This was only needed for runtime compilation and thus is no longer needed in Infrastructure.
It also caused dependency problems with EF Core Design in previous versions.
* Disable CPM for UI project to better reflect consumers
This will ensure that we face any potential dependency issues consumers are also likely to run into.
* Add `Microsoft.CodeAnalysis.CSharp` reference to `Umbraco.Cms.DevelopmentMode.Backoffice`
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