[Docker images] Make the images small again

[CooperLink]

The images got really big when we copied over the usr/share/dotnet dir from the build env because its the whole dotnet sdk. Here I replaced those statements with a statement to just pull dotnet 8 runtime which should reduce the image sizes hopefully.

Releasing new Host versions. V3 Release V2 Release

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• [ ] New Unit tests were added for the changes made and CI is passing.

[pragnagopa]

Closing. Moving to self contained builds