Fix home calculation Fixes #46821 #46836
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Fixes #46821
#46349 was part of a set of changes to support containers that don't have HOME set to anything. Unfortunately, DOTNET_CLI_HOME (which is what we use instead) may not be set to things in other environments, notably with a zip install. Since Path.Combine is used, this led to a null pointer exception.
This changes it to use DOTNET_CLI_HOME by preference and HOME if that's undefined. If neither of those is defined, we skip copying the nuget.config to avoid an error. It's fine to not error in this case since it's best effort anyway.
/cc: @kasperk81 and @baronfel