.NET Interactive: Enable_try_dotnet_to_batch_12b

[v-mepa]

Enable_try_dotnet_to_batch_12b

URL	Batch	Comment
https://docs.microsoft.com/en-us/dotnet/api/system.environment.username	Batch 12
https://docs.microsoft.com/en-us/dotnet/api/system.byte	Batch 12	except sample 1
https://docs.microsoft.com/en-us/dotnet/api/system.bitconverter	Batch 12
https://docs.microsoft.com/en-us/dotnet/api/system.dayofweek	Batch 12
https://docs.microsoft.com/en-us/dotnet/api/system.array.exists	Batch 12

[v-mepa]

fyi @mairaw

[mairaw]

PR looks great. Thanks @v-mepa!