[Skill] shouldn't send EoC in FinalStepAsync

[xieofxie]

What project is affected?

Skill

What language is this in?

C#

What happens?

In sdk, EoC is sent, so no need to send in FinalStepAsync
https://github.com/microsoft/botbuilder-dotnet/blob/373096310de1272ac1f26f2045448b3f40f4ff68/libraries/Microsoft.Bot.Builder.Dialogs/DialogExtensions.cs#L78

What are the steps to reproduce this issue?

What were you expecting to happen?

Can you share any logs, error output, etc.?

Any screenshots or additional context?

[xieofxie]

Tested in 4.8.0-rc5. The bug is fixed and we needn't send EoC in FinalStepAsync